SAP Message V4009 - The customer no. in the sched.agreement differs from the one selected

Diagnosis
The customer number entered in the selection does not agree with thecustomer number in the schedulingagreement.

System Response
The system does not allow the selection or generates a warning message.

Procedure
Please compare the customer number you entered in the selection withthe number in the scheduling agreement. You may be processing the wrongscheduling agreement.