Problem with USEREXIT_SAVE_DOCUMENT

Hi,

I have a requirement that one field in VBAP value should be overwritten just before saving. I have tried USEREXIT_SAVE_DOCUMENT and in debugging I found that the value is populated correctly and modified the XVBAP internal table with the correct value, but after saved I cannot see the new value I can see only the old value.

Could anyone please help me how to solve this.

Thanks a lot in advance.

Murali.