Custom field in table VBAP for incompletion log not functioning as expected

Hello Gurus,

I am facing a strange problem while checking for incompletion log in sales order.

I appended the table VBAP with a custom field and configured it as well.

It works fine if there is any other entry in the incompletion log but doesn't works all alone.

I think SAP is not able to recognize the appended fields.

Is there anyway I could get through this?

Thanks in Advance,

Sumit .