To dispay the error message in PO

Hi All,
When we create a PO in we need to enter some mandatory fields, say payment terms.If we wont enter that field and  tried to save PO. POP up generates(Messages) with RED indicator mentioning ,PAYMENT TERM IS TO BE ENTERED ,Description of the same also get displayed.
                    I want to add my own messages to that POP up . Is any one aware what is the standard FM or any class thrugh which we can add custom messages as well as description of those messages in that standard POP UP oF PO.
Regards,
Vikram Singh.

Hi,
You can show multiple mesages in one pop up using the following function modules
MESSAGES_INITIALIZE
MESSAGE_STORE
MESSAGES_SHOW
Try with these function modules
Regards
Krishna

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