Hi Sam,
I think the note http://service.sap.com/sap/support/notes/1666046
Should help you. It is a recently released one. Please go through !
The documents in question are not flagged as Commitment relevant (technical field name XOBLR) in the database
If field XOBLR is blank in tables EBAN (for PR's) and EKPO (for PO's), FMN3N and FMN4N will not be able to transfer those documents to Funds Management
Resolution
Touching the documents with corresponding change transaction (ME52N, ME22N) would resolve the situation on individual PRs/POs. When touching the documents with ME52N/ME22N, the XOBLR field will be updated (as well as FM in general) assuming that the appropriate FM Account Assignment values are determined
For a mass document transfer, transactions FMCN and FMCT are the appropriate tools because they are able to derive the Funds Management Account Assignment values and set the XOBLR field too.
After FMCN and FMCT, you must post the Purchase documents subsequently in FM with transactions FMN3N and FMN4N.
Regards,
Satan