Zeroed OUt Extended Price/Cost on Purchase Orders

Has anyone had any issues with the Extended Price and/or cost being zeroed within the Purchase Order Process?  We are on E1 9.0. 

There seems to be no consistency with the issue.  The orders types include standard POs and Transfer Orders as well as stock lines (S) and account based lines (J).  Most of the lines have been received when this happens but the issue isn't discovered until time of vouchering.