SAP Message WRF_PRC_OTB019 - The delivery date is not allowed to be in the past

Diagnosis Within OTB procurement, a delivery date can only be moved into thefuture. Procedure Move the delivery date into the future, or leave the delivery date atits original value. If you want to reverse a date change that has beencarried out, you must do this explicitly using the "Undo" functionality.