ORDERS01 IDoc update issue

Hi ,

I have been trying the update ORDERS01 IDoc for ME22N/ME21N. The IDoc are generated using the message control.

The Enhancement used is MM06E001 in this I have coded logic in EXIT_SAPLEINM_002.

It never goes to my code, I have even tried user-specific break-point. please suggest.

Please let me know if there is some other way to manipulate the IDoc data ( on save/ create PO) before posting IDoc.