There are two types of batch error messages: the automatic messages which are generated from the controls entered on the Segment description, and the explicit messages which are user-defined.
Automatic error messages correspond to the controls entered on the Segment -CE Lines.
You can modify these messages and/or supplement them with documentary text.
Only the controls coded on the Data element calls in Segments cause error messages to be automatically generated. For all the other types of errors, detected by other controls, error messages must be defined explicitly with specific code.
These messages must then be attached to the transaction Data Structure to which they apply. Any program with appropriate messages may be associated with the transaction. However since two programs maximum can be associated, it is advised to design a program or two whose only purpose is to contain these messages.