FIELDERROR

Never use FIELDERROR with a period as it is automatically inserted.

Bad code

InvalidValue@1025 : TextConst 'ENU=is invalid.';
...
Cust.FIELDERROR("No.",InvalidValue);

Good code

InvalidValue@1025 : TextConst 'ENU=is invalid';
...
Cust.FIELDERROR("No.",InvalidValue);