I'm setting up a contract system, I thur me31k to create a quantity contract. then create sales order, and via me57 to create po, after that, the system can auto assign the contract to me, it's work find, but the problem is when i have more than one contract, the system will prompt to choose one contract even the contract is completed (all related PO quantity > contract quantity). I would like to know, how can I make the contract PO is close and it won't be use by PO. Thanks!