diff --git a/flecmd/adif.go b/flecmd/adif.go
index 367ef16..c629809 100644
--- a/flecmd/adif.go
+++ b/flecmd/adif.go
@@ -19,6 +19,7 @@ limitations under the License.
 import (
 	"FLEcli/fleprocess"
 	"fmt"
+	"os"
 
 	"github.com/spf13/cobra"
 )
@@ -49,13 +50,18 @@ var adifCmd = &cobra.Command{
 			return fmt.Errorf("Too many arguments.%s", "")
 		}
 
-		fleprocess.ProcessAdifCommand(
+		err := fleprocess.ProcessAdifCommand(
 			inputFilename,
 			outputFilename,
 			isInterpolateTime,
 			isWWFFcli,
 			isSOTAcli,
 			isOverwrite)
+		if err != nil {
+			fmt.Println("\nUnable to generate ADIF file:")
+			fmt.Println(err)
+			os.Exit(1)
+		}
 
 		return nil
 	},
diff --git a/fleprocess/adif_process.go b/fleprocess/adif_process.go
index c1b4f40..74f7b9b 100644
--- a/fleprocess/adif_process.go
+++ b/fleprocess/adif_process.go
@@ -18,43 +18,114 @@ limitations under the License.
 
 import (
 	"fmt"
+	"strings"
 )
 
-//ProcessAdifCommand FIXME
-func ProcessAdifCommand(inputFilename, outputFilename string, isInterpolateTime, isWWFFcli, isSOTAcli, isOverwrite bool) {
+//ProcessAdifCommand loads an FLE input to produce an adif file (eventually in WWFF format). It is called from the COBRA interface
+func ProcessAdifCommand(inputFilename, outputFilename string, isInterpolateTime, isWWFFcli, isSOTAcli, isOverwrite bool) error {
 
-	verifiedOutputFilename, err := buildOutputFilename(outputFilename, inputFilename, isOverwrite, ".adi")
+	//Validate of build the output filenaem
+	var verifiedOutputFilename string
+	var err error
 
-	// if the output file could not be parsed correctly do noting
-	if err == nil {
-		loadedLogFile, isLoadedOK := LoadFile(inputFilename, isInterpolateTime)
+	if verifiedOutputFilename, err = buildOutputFilename(outputFilename, inputFilename, isOverwrite, ".adi"); err != nil {
+		return err
+	}
 
-		if isLoadedOK {
-			if len(loadedLogFile) == 0 {
-				fmt.Println("No useful data read. Aborting...")
-				return
-			}
+	//Load the input file
+	var loadedLogFile []LogLine
+	var isLoadedOK bool
+
+	if loadedLogFile, isLoadedOK = LoadFile(inputFilename, isInterpolateTime); isLoadedOK == false {
+		return fmt.Errorf("There were input file parsing errors. Could not generate ADIF file")
+	}
+
+	//Check if we have all the necessary data
+	if err := validateDataforAdif(loadedLogFile, isWWFFcli, isSOTAcli); err != nil {
+		return err
+	}
+
+	//Write the output file with the checked data
+	OutputAdif(verifiedOutputFilename, loadedLogFile, isWWFFcli, isSOTAcli)
+
+	//If we reached this point, everything was processed OK and the file generated
+	return nil
+}
+
+//validateDataforAdif checks whether all the required data is present
+//The details of the mandatory files can be found at http://wwff.co/rules-faq/confirming-and-sending-log/
+func validateDataforAdif(loadedLogFile []LogLine, isWWFFcli, isSOTAcli bool) error {
+
+	//do we have QSOs at all?
+	if len(loadedLogFile) == 0 {
+		return fmt.Errorf("No QSO found")
+	}
+
+	//MySOTA, MyWWFF and MyCall are header values. If missing on the first line, it will be missing at every line
+	if loadedLogFile[0].MyCall == "" {
+		return fmt.Errorf("Missing MyCall")
+	}
+	if isSOTAcli {
+		if loadedLogFile[0].MySOTA == "" {
+			return fmt.Errorf("Missing MY-SOTA reference")
+		}
+	}
+	if isWWFFcli {
+		if loadedLogFile[0].MyWWFF == "" {
+			return fmt.Errorf("Missing MY-WWFF reference")
+		}
+		if loadedLogFile[0].Operator == "" {
+			return fmt.Errorf("Missing Operator call sign")
+		}
+	}
+
+	var errorsBuffer strings.Builder
+	//We accumulate the errors messages
+	for i := 0; i < len(loadedLogFile); i++ {
 
-			//TODO: There are more tests required here
-			//check if we have the necessary information for the type
-			if isWWFFcli {
-				if loadedLogFile[0].MyWWFF == "" {
-					fmt.Println("Missing MY-WWFF reference. Aborting...")
-					return
-				}
-				if loadedLogFile[0].Operator == "" {
-					fmt.Println("Missing Operator. Aborting...")
-					return
-				}
+		//Compute the error location for a meaning full error
+		var errorLocation string
+		if loadedLogFile[i].Time == "" {
+			errorLocation = fmt.Sprintf("for log entry #%d", i+1)
+		} else {
+			errorLocation = fmt.Sprintf("for log entry at %s (#%d)", loadedLogFile[i].Time, i+1)
+		}
+
+		if loadedLogFile[i].Date == "" {
+			if errorsBuffer.String() != "" {
+				errorsBuffer.WriteString(fmt.Sprintf(", "))
 			}
-			if isSOTAcli {
-				if loadedLogFile[0].MySOTA == "" {
-					fmt.Println("Missing MY-SOTA reference. Aborting...")
-					return
-				}
+			errorsBuffer.WriteString(fmt.Sprintf("missing date %s", errorLocation))
+		}
+		if loadedLogFile[i].Band == "" {
+			if errorsBuffer.String() != "" {
+				errorsBuffer.WriteString(fmt.Sprintf(", "))
 			}
-
-			OutputAdif(verifiedOutputFilename, loadedLogFile, isWWFFcli, isSOTAcli)
+			errorsBuffer.WriteString(fmt.Sprintf("missing band %s", errorLocation))
+		}
+		if loadedLogFile[i].Mode == "" {
+			if errorsBuffer.String() != "" {
+				errorsBuffer.WriteString(fmt.Sprintf(", "))
+			}
+			errorsBuffer.WriteString(fmt.Sprintf("missing mode %s", errorLocation))
+		}
+		if loadedLogFile[i].Call == "" {
+			if errorsBuffer.String() != "" {
+				errorsBuffer.WriteString(fmt.Sprintf(", "))
+			}
+			errorsBuffer.WriteString(fmt.Sprintf("missing call %s", errorLocation))
+		}
+		if loadedLogFile[i].Time == "" {
+			if errorsBuffer.String() != "" {
+				errorsBuffer.WriteString(fmt.Sprintf(", "))
+			}
+			errorsBuffer.WriteString(fmt.Sprintf("missing QSO time %s", errorLocation))
 		}
 	}
+	if errorsBuffer.String() != "" {
+		return fmt.Errorf(errorsBuffer.String())
+	}
+
+	//If we reached here, all is ok
+	return nil
 }
diff --git a/fleprocess/adif_process_test.go b/fleprocess/adif_process_test.go
new file mode 100644
index 0000000..08df0c9
--- /dev/null
+++ b/fleprocess/adif_process_test.go
@@ -0,0 +1,149 @@
+package fleprocess
+
+import (
+	"fmt"
+	"testing"
+)
+
+func Test_validateDataforAdif(t *testing.T) {
+	type args struct {
+		loadedLogFile []LogLine
+		isWWFFcli     bool
+		isSOTAcli     bool
+	}
+	tests := []struct {
+		name string
+		args args
+		want error
+	}{
+		{
+			"Happy Case (no sota or wwff)",
+			args{isWWFFcli: false, isSOTAcli: false, loadedLogFile: []LogLine{
+				{Date: "date", MyCall: "myCall", MySOTA: "mySota", Mode: "mode", Band: "band", Time: "time", Call: "call"},
+				{Date: "date", MyCall: "myCall", MySOTA: "mySota", Mode: "mode", Band: "band", Time: "time", Call: "call"},
+				{Date: "date", MyCall: "myCall", MySOTA: "mySota", Mode: "mode", Band: "band", Time: "time", Call: "call"}},
+			},
+			nil,
+		},
+		{
+			"No data",
+			args{isWWFFcli: false, isSOTAcli: false, loadedLogFile: []LogLine{}},
+			fmt.Errorf("No QSO found"),
+		},
+		{
+			"Missing Date",
+			args{isWWFFcli: false, isSOTAcli: false, loadedLogFile: []LogLine{
+				{Date: "date", MyCall: "myCall", MySOTA: "mySota", Mode: "mode", Band: "band", Time: "12:01", Call: "call"},
+				{Date: "", MyCall: "myCall", MySOTA: "mySota", Mode: "mode", Band: "band", Time: "12:02", Call: "call"},
+				{Date: "", MyCall: "myCall", MySOTA: "mySota", Mode: "mode", Band: "band", Time: "12:03", Call: "call"}},
+			},
+			fmt.Errorf("missing date for log entry at 12:02 (#2), missing date for log entry at 12:03 (#3)"),
+		},
+		{
+			"Missing MyCall",
+			args{isWWFFcli: true, isSOTAcli: true, loadedLogFile: []LogLine{
+				{Date: "date", MyCall: "", MySOTA: "mySota", Mode: "mode", Band: "band", Time: "12:01", Call: "call"},
+				{Date: "date", MyCall: "", MySOTA: "mySota", Mode: "mode", Band: "band", Time: "12:02", Call: "call"},
+				{Date: "date", MyCall: "", MySOTA: "mySota", Mode: "mode", Band: "band", Time: "12:03", Call: "call"}},
+			},
+			fmt.Errorf("Missing MyCall"),
+		},
+		{
+			"Missing MySota",
+			args{isWWFFcli: false, isSOTAcli: true, loadedLogFile: []LogLine{
+				{Date: "date", MyCall: "myCall", MySOTA: "", Mode: "mode", Band: "band", Time: "time", Call: "call"},
+				{Date: "date", MyCall: "myCall", MySOTA: "", Mode: "mode", Band: "band", Time: "time", Call: "call"},
+				{Date: "date", MyCall: "myCall", MySOTA: "", Mode: "mode", Band: "band", Time: "time", Call: "call"}},
+			},
+			fmt.Errorf("Missing MY-SOTA reference"),
+		},
+		{
+			"Misc. missing data (Band, Time, Mode, Call)",
+			args{isWWFFcli: false, isSOTAcli: false, loadedLogFile: []LogLine{
+				{Date: "date", MyCall: "myCall", MySOTA: "mySota", Mode: "mode", Band: "", Time: "", Call: "call"},
+				{Date: "date", MyCall: "myCall", MySOTA: "mySota", Mode: "", Band: "band", Time: "12:02", Call: "call"},
+				{Date: "date", MyCall: "myCall", MySOTA: "mySota", Mode: "mode", Band: "band", Time: "12:03", Call: ""}},
+			},
+			fmt.Errorf("missing band for log entry #1, missing QSO time for log entry #1, missing mode for log entry at 12:02 (#2), missing call for log entry at 12:03 (#3)"),
+		},
+		{
+			"Missing MY-WWFF",
+			args{isWWFFcli: true, isSOTAcli: false, loadedLogFile: []LogLine{
+				{Date: "date", MyCall: "myCall", MySOTA: "mySota", MyWWFF: "", Mode: "mode", Band: "band", Time: "time", Call: "call"},
+				{Date: "date", MyCall: "myCall", MySOTA: "mySota", MyWWFF: "", Mode: "mode", Band: "band", Time: "time", Call: "call"},
+				{Date: "date", MyCall: "myCall", MySOTA: "mySota", MyWWFF: "", Mode: "mode", Band: "band", Time: "time", Call: "call"}},
+			},
+			fmt.Errorf("Missing MY-WWFF reference"),
+		},
+		{
+			"Missing MY-WWFF",
+			args{isWWFFcli: true, isSOTAcli: false, loadedLogFile: []LogLine{
+				{Date: "date", MyCall: "myCall", MyWWFF: "myWwff", Operator: "", Mode: "mode", Band: "band", Time: "time", Call: "call"},
+				{Date: "date", MyCall: "myCall", MyWWFF: "myWwff", Operator: "", Mode: "mode", Band: "band", Time: "time", Call: "call"},
+				{Date: "date", MyCall: "myCall", MyWWFF: "myWwff", Operator: "", Mode: "mode", Band: "band", Time: "time", Call: "call"}},
+			},
+			fmt.Errorf("Missing Operator call sign"),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := validateDataforAdif(tt.args.loadedLogFile, tt.args.isWWFFcli, tt.args.isSOTAcli)
+
+			//Test the error message, if any
+			if got != nil && tt.want != nil {
+				if got.Error() != tt.want.Error() {
+					t.Errorf("validateDataforAdif() = %v, want %v", got, tt.want)
+				}
+			} else {
+				if !(got == nil && tt.want == nil) {
+					t.Errorf("validateDataforAdif() = %v, want %v", got, tt.want)
+				}
+			}
+		})
+	}
+}
+
+func TestProcessAdifCommand(t *testing.T) {
+	type args struct {
+		inputFilename     string
+		outputFilename    string
+		isInterpolateTime bool
+		isWWFFcli         bool
+		isSOTAcli         bool
+		isOverwrite       bool
+	}
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+	}{
+		{
+			"Bad output filename (directory)",
+			args{inputFilename: "../test/data/fle-4-no-qso.txt", outputFilename: "../test/data", isInterpolateTime: false, isOverwrite: false},
+			true,
+		},
+		{
+			"input file parsing errors (missing band)",
+			args{inputFilename: "../test/data/fle-3-error.txt", outputFilename: "", isInterpolateTime: false, isOverwrite: false},
+			true,
+		},
+		{
+			"input file parsing errors (wrong call)",
+			args{inputFilename: "../test/data/fle-5-wrong-call.txt", outputFilename: "", isInterpolateTime: false, isOverwrite: false},
+			true,
+		},
+		{
+			"No QSO in loaded file",
+			args{inputFilename: "../test/data/fle-4-no-qso.txt", outputFilename: "", isInterpolateTime: false, isOverwrite: false},
+			true,
+		},
+		
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := ProcessAdifCommand(tt.args.inputFilename, tt.args.outputFilename, tt.args.isInterpolateTime, tt.args.isWWFFcli, tt.args.isSOTAcli, tt.args.isOverwrite); (err != nil) != tt.wantErr {
+				t.Errorf("ProcessCsvCommand() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}
diff --git a/fleprocess/csv_process.go b/fleprocess/csv_process.go
index 15161c4..935ef48 100644
--- a/fleprocess/csv_process.go
+++ b/fleprocess/csv_process.go
@@ -24,13 +24,13 @@ import (
 )
 
 //ProcessCsvCommand loads an FLE input to produce a SOTA CSV
-func ProcessCsvCommand(inputFilename, outputCsvFilename string, isInterpolateTime, isOverwriteCsv bool) error {
+func ProcessCsvCommand(inputFilename, outputFilename string, isInterpolateTime, isOverwriteCsv bool) error {
 
 	//Validate of build the output filenaem
 	var verifiedOutputFilename string
 	var err error
 
-	if verifiedOutputFilename, err = buildOutputFilename(outputCsvFilename, inputFilename, isOverwriteCsv, ".csv"); err != nil {
+	if verifiedOutputFilename, err = buildOutputFilename(outputFilename, inputFilename, isOverwriteCsv, ".csv"); err != nil {
 		return err
 	}
 
@@ -50,11 +50,10 @@ func ProcessCsvCommand(inputFilename, outputCsvFilename string, isInterpolateTim
 	outputCsv(verifiedOutputFilename, loadedLogFile)
 
 	return nil
-		
 
-	
 }
 
+//validateDataForSotaCsv checks whether all the requiered data is present in the supplied data
 func validateDataForSotaCsv(loadedLogFile []LogLine) error {
 	if len(loadedLogFile) == 0 {
 		return fmt.Errorf("No QSO found")
diff --git a/fleprocess/csv_process_test.go b/fleprocess/csv_process_test.go
index 48715d9..c6d992f 100644
--- a/fleprocess/csv_process_test.go
+++ b/fleprocess/csv_process_test.go
@@ -63,18 +63,54 @@ func Test_validateDataForSotaCsv(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			got := validateDataForSotaCsv(tt.args.loadedLogFile)
-			if tt.want == nil || got == nil {
-				if tt.want == nil && got != nil {
-					t.Errorf("validateDataForSotaCsv() = %v, want %v", got, nil)
-				}
-				if tt.want != nil && got == nil {
-					t.Errorf("validateDataForSotaCsv() = %v, want %v", nil, tt.want)
+
+			//Test the error message, if any
+			if got != nil && tt.want != nil {
+				if got.Error() != tt.want.Error() {
+					t.Errorf("validateDataForSotaCsv() = %v, want %v", got, tt.want)
 				}
 			} else {
-				if got.Error() != tt.want.Error() {
+				if !(got == nil && tt.want == nil) {
 					t.Errorf("validateDataForSotaCsv() = %v, want %v", got, tt.want)
 				}
 			}
 		})
 	}
 }
+
+func TestProcessCsvCommand(t *testing.T) {
+	type args struct {
+		inputFilename     string
+		outputCsvFilename string
+		isInterpolateTime bool
+		isOverwriteCsv    bool
+	}
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+	}{
+		{
+			"Bad output filename (directory)",
+			args{inputFilename: "../test/data/fle-4-no-qso.txt", outputCsvFilename: "../test/data", isInterpolateTime: false, isOverwriteCsv: false},
+			true,
+		},
+		{
+			"input file parsing errors",
+			args{inputFilename: "../test/data/fle-3-error.txt", outputCsvFilename: "", isInterpolateTime: false, isOverwriteCsv: false},
+			true,
+		},
+		{
+			"No QSO in loaded file",
+			args{inputFilename: "../test/data/fle-4-no-qso.txt", outputCsvFilename: "", isInterpolateTime: false, isOverwriteCsv: false},
+			true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := ProcessCsvCommand(tt.args.inputFilename, tt.args.outputCsvFilename, tt.args.isInterpolateTime, tt.args.isOverwriteCsv); (err != nil) != tt.wantErr {
+				t.Errorf("ProcessCsvCommand() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}
diff --git a/fleprocess/output_filename.go b/fleprocess/output_filename.go
index a6bff67..4795f36 100644
--- a/fleprocess/output_filename.go
+++ b/fleprocess/output_filename.go
@@ -55,4 +55,3 @@ func buildOutputFilename(output string, input string, overwrite bool, newExtensi
 
 	return "", fmt.Errorf("File already exists. Use --overwrite flag if necessary")
 }
-
diff --git a/fleprocess/output_filename_test.go b/fleprocess/output_filename_test.go
index 4ccc856..e8ac8c7 100644
--- a/fleprocess/output_filename_test.go
+++ b/fleprocess/output_filename_test.go
@@ -103,15 +103,18 @@ func Test_buildOutputFilename(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			gotOutputFilename, gotErr := buildOutputFilename(tt.args.output, tt.args.input, tt.args.overwrite, tt.args.extension)
+
 			if gotOutputFilename != tt.wantOutputFilename {
 				t.Errorf("buildOutputFilename() gotOutputFilename = %v, want %v", gotOutputFilename, tt.wantOutputFilename)
 			}
+
+			//test the error message, if any
 			if gotErr != nil && tt.wantError != nil {
 				if gotErr.Error() != tt.wantError.Error() {
 					t.Errorf("buildOutputFilename() error = %v, want %v", gotErr, tt.wantError)
 				}
 			} else {
-				if!(gotErr == nil && tt.wantError == nil) {
+				if !(gotErr == nil && tt.wantError == nil) {
 					t.Errorf("buildOutputFilename() error = %v, want %v", gotErr, tt.wantError)
 				}
 			}
diff --git a/test/data/fle-5-wrong-call.txt b/test/data/fle-5-wrong-call.txt
new file mode 100644
index 0000000..462c501
--- /dev/null
+++ b/test/data/fle-5-wrong-call.txt
@@ -0,0 +1,12 @@
+date 2020-07-19
+mycall  ON6ZQ/P
+mysota  ON/ON-018
+
+#wrong call
+cw
+30m
+1150
+
+55 ix1ihr
+onyz4/f8dgf
+56 ea2dt
\ No newline at end of file