Solution : https://service.sap.com/sap/support/notes/355383 (SAP Service marketplace login required)
Key words :
additional key words me51, temporary document number, transaction me51, document number ' ', document number, purchase requisition, eban-banfn, ebkn-banfn, purchase requisitions, transaction me51n
Related Notes :
| 429910 | Correction report for PReqs with 'temporary' document number |
| 391011 | Empty or incorrect document number when saving PReq |
| 355560 | ME51N doc number '# 1' for number range object error |