Reversal accounting document type not possible in MIGO

Hi All,

I am facing one issue, I have created service purchase order, and did ML81n. The  client requirement is for cancellation of service entry sheet, it should hit different number range. But when i check in MIGO its hitting same document type WE its not hitting reversal document type.

I have assigned reversal document type in OBF4. But i could not get reversal document type after reverse posting.

How to get reversal document type in MIGO? Do i need to maintain any other settings other than OBF4?

Kindly Suggest

Regards

Subbu.