SAP Message VO055 - There is an open transfer order &2 (warehouse no. &3) for delivery &1

Diagnosis
The open transfer orderV2 exists for delivery v1 forwarehouse number &V3&.However, you cannot change the assignment of the delivery to awave pick as long as thereare open transfer orders for this delivery.

System Response
The system rejects the change.

Procedure
Confirm or cancel the opentransfer order before you move the delivery to a different wave pick,or delete it from a wave pick.