Normally the error FZ003 appears if you create a payment proposal for some payment ID, date; then leave it as is; then create another payment ID, date and execute payment proposal generation. Vendors/customers are blocked in the first payment proposal.so pls.check whether you have several other proposals which are outstanding. if yes, then you could delete these payment proposals or execute the payment runs to the end. This action will allow to execute subsequent payment runs as company code will be unblocked for the subsequent payment runs by the system. Don't forget to delete unsuccessful payment proposals (with error FZ003) and run proposal generation again.