HERE IS THE QUESTION: Where is the CCID coming from for the DR on a PO receipt into Shop Floor

HERE IS THE QUESTION: Where is the CCID coming from for the DR on a PO receipt into Shop Floor?  The purchase order or the work order?  If it is taking the CCID from the WIP Accounting Class then the charge account on the PO is not used at all?  Yet it is mandatory?
We would like the Cost manager to use the charge account on the PO instead of the Material Valuation account on the job. We are changing the charge account on the PO and would like that CCID used when performing a PO receipt into a Shop Floor destination.  What we are seeing is it uses the WIP Valuation Account regardless of what is on the PO.