Solution : https://service.sap.com/sap/support/notes/408432 (SAP Service marketplace login required)
Key words :
emlif lblkz me57 reason, contract/delivery schedule exists, delivery address data vendor, source list entry exists, delivery address screen, contract/delivery schedule, source list entry, item detail screen, error message me581, transaction me56/me57
Related Notes :
| 857367 | ME581 SC vendor in PReq and outline agreement different |
| 457110 | FAQ: Source determination in purchasing |