When firming to a PUrch agreement using planned PO's, it is not allowed to have two Agreements for the same vendor with the same item but the system never says so If you do have that situation, the second Agreement with the higher ID will forever be ignored. The same is true when you have two lines for the same item on the agreement. The system should warn the user when the same item appears in the same validity period either in the same agreement or in another agreement for the same vendor. The warning is exactly what you would see in the BOM.. when two BOM versions are defined in the same time period. This will prevent disappointed users who spent hours creating Purch agreements, organizing some as multiple agreements for the same vendor for certain business reasons, and they never get any error.