diff --git a/lib/src/ai.dart b/lib/src/ai.dart
index c7ff06c..6c8ef7a 100644
--- a/lib/src/ai.dart
+++ b/lib/src/ai.dart
@@ -250,9 +250,9 @@ class AI {
       description: 'GLN extension component',
     ),
     '255': const AI(
-      code: '253',
+      code: '255',
       type: AIFormatType.VARIABLE_LENGTH_MEASURE,
-      dataTitle: '255',
+      dataTitle: 'GCN',
       regExpString: r'^255(\d{13})(\d{0,12})$',
       description: 'Global Coupon Number (GCN)',
     ),
@@ -353,13 +353,13 @@ class AI {
         fixLength: 6,
         regExpString: r'^3115(\d{6})$'),
     '3120': const AI(
-        code: '3110',
+        code: '3120',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'WIDTH (m)',
         description:
             'Width, diameter, or second dimension, metres (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3110(\d{6})$'),
+        regExpString: r'^3120(\d{6})$'),
     '3121': const AI(
         code: '3121',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
@@ -475,28 +475,28 @@ class AI {
         dataTitle: 'AREA (m2)',
         description: 'Area, square metres (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3140(\d{6})$'),
+        regExpString: r'^3143(\d{6})$'),
     '3144': const AI(
         code: '3144',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'AREA (m2)',
         description: 'Area, square metres (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3140(\d{6})$'),
+        regExpString: r'^3144(\d{6})$'),
     '3145': const AI(
         code: '3145',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'AREA (m2)',
         description: 'Area, square metres (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3140(\d{6})$'),
+        regExpString: r'^3145(\d{6})$'),
     '3150': const AI(
-        code: '3140',
+        code: '3150',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'NET VOLUME (l)',
         description: 'Net volume, litres (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3140(\d{6})$'),
+        regExpString: r'^3150(\d{6})$'),
     '3151': const AI(
         code: '3151',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
@@ -559,21 +559,21 @@ class AI {
         dataTitle: 'NET VOLUME (m3)',
         description: 'Net volume, cubic metres (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3160(\d{6})$'),
+        regExpString: r'^3163(\d{6})$'),
     '3164': const AI(
         code: '3164',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'NET VOLUME (m3)',
         description: 'Net volume, cubic metres (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3160(\d{6})$'),
+        regExpString: r'^3164(\d{6})$'),
     '3165': const AI(
         code: '3165',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'NET VOLUME (m3)',
         description: 'Net volume, cubic metres (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3160(\d{6})$'),
+        regExpString: r'^3165(\d{6})$'),
     '3200': const AI(
         code: '3200',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
@@ -608,14 +608,14 @@ class AI {
         dataTitle: 'NET WEIGHT (lb)',
         description: 'Net weight, pounds (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3200(\d{6})$'),
+        regExpString: r'^3204(\d{6})$'),
     '3205': const AI(
         code: '3205',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'NET WEIGHT (lb)',
         description: 'Net weight, pounds (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3200(\d{6})$'),
+        regExpString: r'^3205(\d{6})$'),
     '3210': const AI(
         code: '3210',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
@@ -633,13 +633,13 @@ class AI {
         fixLength: 6,
         regExpString: r'^3211(\d{6})$'),
     '3212': const AI(
-        code: '3210',
+        code: '3212',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'LENGTH (in)',
         description:
             'Length or first dimension, inches (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3211(\d{6})$'),
+        regExpString: r'^3212(\d{6})$'),
     '3213': const AI(
         code: '3213',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
@@ -657,13 +657,13 @@ class AI {
         fixLength: 6,
         regExpString: r'^3214(\d{6})$'),
     '3215': const AI(
-        code: '3214',
+        code: '3215',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'LENGTH (in)',
         description:
             'Length or first dimension, inches (variable measure trade item)',
         fixLength: 6,
-        regExpString: r'^3214(\d{6})$'),
+        regExpString: r'^3215(\d{6})$'),
     '3220': const AI(
         code: '3220',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
@@ -753,7 +753,7 @@ class AI {
         fixLength: 6,
         regExpString: r'^3234(\d{6})$'),
     '3235': const AI(
-        code: '3230',
+        code: '3235',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'LENGTH (yd)',
         description:
@@ -1049,7 +1049,7 @@ class AI {
         fixLength: 6,
         regExpString: r'^3295(\d{6})$'),
     '3300': const AI(
-        code: '3295',
+        code: '3300',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'GROSS WEIGHT (kg)',
         description: 'Logistic weight, kilograms',
@@ -1658,7 +1658,7 @@ class AI {
         fixLength: 6,
         regExpString: r'^3462(\d{6})$'),
     '3463': const AI(
-        code: '3460',
+        code: '3463',
         type: AIFormatType.FIXED_LENGTH_MEASURE,
         dataTitle: 'WIDTH (yd), log',
         description: 'Width, diameter, or second dimension, yard',
@@ -2001,7 +2001,7 @@ class AI {
         description: 'Company internal information',
         regExpString: '^97($_ALLOW_CHAR{0,90})\$'),
     '98': const AI(
-        code: '99',
+        code: '98',
         type: AIFormatType.VARIABLE_LENGTH,
         dataTitle: 'INTERNAL',
         description: 'Company internal information',
diff --git a/test/issue_16_test.dart b/test/issue_16_test.dart
new file mode 100644
index 0000000..3eadf2b
--- /dev/null
+++ b/test/issue_16_test.dart
@@ -0,0 +1,122 @@
+import 'package:gs1_barcode_parser/gs1_barcode_parser.dart';
+import 'package:test/test.dart';
+
+main() {
+  group('AI code/regExpString consistency', () {
+    final aiCodesToVerify = [
+      '3120',
+      '3143',
+      '3144',
+      '3145',
+      '3150',
+      '3163',
+      '3164',
+      '3165',
+      '3204',
+      '3205',
+      '3212',
+      '3215',
+      '3235',
+      '3300',
+      '3463',
+      '98',
+      '255',
+    ];
+
+    for (final aiCode in aiCodesToVerify) {
+      test('AI $aiCode: code field matches map key', () {
+        final ai = AI.AIS[aiCode];
+        expect(ai, isNotNull);
+        expect(ai!.code, equals(aiCode));
+      });
+
+      test('AI $aiCode: regExpString matches code', () {
+        final ai = AI.AIS[aiCode];
+        expect(ai!.regExp.pattern, contains(aiCode),
+            reason:
+                "regExpString '${ai.regExp.pattern}' should contain AI code '$aiCode'");
+      });
+    }
+  });
+
+  group('Parse fixed-length measure AIs', () {
+    test('3143 parse succeeds', () {
+      final parser = GS1BarcodeParser.defaultParser();
+      final result = parser.parse('3143005250');
+      expect(result.hasAI('3143'), true);
+      expect(result.getAIRawData('3143'), '005250');
+    });
+
+    test('3150 parse succeeds', () {
+      final parser = GS1BarcodeParser.defaultParser();
+      final result = parser.parse('3150005250');
+      expect(result.hasAI('3150'), true);
+      expect(result.getAIRawData('3150'), '005250');
+    });
+
+    test('3163 parse succeeds', () {
+      final parser = GS1BarcodeParser.defaultParser();
+      final result = parser.parse('3163005250');
+      expect(result.hasAI('3163'), true);
+      expect(result.getAIRawData('3163'), '005250');
+    });
+
+    test('3204 parse succeeds', () {
+      final parser = GS1BarcodeParser.defaultParser();
+      final result = parser.parse('3204005250');
+      expect(result.hasAI('3204'), true);
+      expect(result.getAIRawData('3204'), '005250');
+    });
+
+    test('3235 parse succeeds', () {
+      final parser = GS1BarcodeParser.defaultParser();
+      final result = parser.parse('3235005250');
+      expect(result.hasAI('3235'), true);
+      expect(result.getAIRawData('3235'), '005250');
+    });
+
+    test('3300 parse succeeds', () {
+      final parser = GS1BarcodeParser.defaultParser();
+      final result = parser.parse('3300005250');
+      expect(result.hasAI('3300'), true);
+      expect(result.getAIRawData('3300'), '005250');
+    });
+
+    test('3463 parse succeeds', () {
+      final parser = GS1BarcodeParser.defaultParser();
+      final result = parser.parse('3463005250');
+      expect(result.hasAI('3463'), true);
+      expect(result.getAIRawData('3463'), '005250');
+    });
+  });
+
+  group('Parse 2-digit variable-length AI 98', () {
+    test('98 parse succeeds', () {
+      final parser = GS1BarcodeParser.defaultParser();
+      final result = parser.parse('98TESTDATA123');
+      expect(result.hasAI('98'), true);
+      expect(result.getAIRawData('98'), 'TESTDATA123');
+    });
+  });
+
+  group('Parse variable-length measure AI 255', () {
+    test('255 parse succeeds', () {
+      final parser = GS1BarcodeParser.defaultParser();
+      final result = parser.parse('2551234567890123');
+      expect(result.hasAI('255'), true);
+      expect(result.getAIRawData('255'), '1234567890123');
+    });
+  });
+
+  group('Issue 16 scenario - barcode with 3143', () {
+    test('Barcode with 3143 no longer throws data format mismatch', () {
+      final parser = GS1BarcodeParser.defaultParser();
+      final barcode = '010020406700035931430052503700100';
+      final result = parser.parse(barcode);
+      expect(result.hasAI('01'), true);
+      expect(result.hasAI('3143'), true);
+      expect(result.hasAI('37'), true);
+      expect(result.getAIRawData('3143'), '005250');
+    });
+  });
+}