please enter the required value for the address line 1 segment in the check address flexfield

Dear,
We create a employee as a supplier and we made the prepayment and sucessfully done the invoice validation and Creat Accounting then we go the payament screen and made the payment against prepayment then save and when I run the create accounting then I got these error message "please enter the required value for the address line 1 segment in the check address flexfield" and my accounting caanot be created. Please advise.