code issue fix

src/yolo/annotation_generator.py

@@ -21,6 +21,7 @@ FIELD_CLASSES = {
     'Plusgiro': 5,
     'Amount': 6,
     'supplier_organisation_number': 7,
+    'customer_number': 8,
 }
 
 # Fields that need matching but map to other YOLO classes
@@ -41,6 +42,7 @@ CLASS_NAMES = [
     'plusgiro',
     'amount',
     'supplier_org_number',
+    'customer_number',
 ]