Not able to convert PR in to service PO ( item category D ) using ME59

Hi ,

All the document type mapping has been done correctly in t161a table and Me59 is working for goods PR from B2B .However not able to get service PR ( item category D ) from B2B converted in to service PO in SAP using Me59 .I have checked the vendor master and auto po has been checked in the master record .system throws error 'no requisition found'.

Please provide inputs if there any other settings which would need to be done if it is a service PO

Thanks & Regards

Sumi Rachel