SAP Message TU609 - Yearly advance payment in connection with deregulation is not permitted

Diagnosis
Contract account &V1& participates in theyearly advance payment(YAP).
You want to create a budget billing plan for contract &V2&.Invoicing service provider &V3& is maintainedin this contract.
However, contracts that are regulated by a third party are not supposedto have budget billing plans with YAP.

System Response
The budget billing plan is created without the YAP object.