Evaluated Receipt Settlement (ERS) flag in the PO
the Purchase Order at the backend has not been set the flag "Evaluated Receipt Settlement (ERS)" after a user has created a shopping card in the SRM.
What can cauise this problem
It is not clear to me if you are looking at an existing contract after the vendor master has been changed or if you have created a new contract.
ERS is not retroactive - so if the purchasing document was created before the vendor was changed then the ERS field will not be checked. If you are creating a new purchasing document after the vendor was changed and the ERS field is not checked then you might want to check the info record.