Problem:
You may have validation defined for your Dailog System screenset, but the messages in the error message file do not appearwhen an invalid value is entered.
Resolution:
This could be because you have not defined the path of the error message file correctly (this is done by clicking on 'Resource Files' for the screenset and completing the appropriate field). Dialog System does not display an error when the mesage file is not found, it just displays spaces instead of the desired message.