Issue while assigning the customer project (J11) Billing WBS element to a sales order item

Hi Team,

We are getting the beneath mistake portion assigning the lawsuit task (J11) billing WBS constituent to a income bid item. This mistake is not understandable and hence delight explain, what is this mistake and wherefore we are getting erstwhile assigning the billing WBS element?

Error" Requested relation ENT1 is not disposable here"

Thanks & Regards,

Rao.