PO Change acknowledgement (865) transaction schema. Dates returned will be the actual value now in the vendor's system. The creation date of the transaction referred to by this element. Format is CCYY-MM-DD. The time on creationDate that the document was created. Format is HH:MM:SS. The creation date of the transaction referred to by this element. Format is CCYY-MM-DD. The time on creationDate that the document was created. Format is HH:MM:SS.