SAP Message 12004 - Production date of bch &1 (&2) does not match the prod. date entered (&3)

Diagnosis
In the item you are currently moving, you have entered a batch thatalready exists. The production date in the batch master for this batchis different from the production date that was entered in the currentitem.

System Response
If you confirm the message, the system copies the production date ofthe current item into the master record for batch &V1& when theposting is carried out.