Material Issues do not match work order material dollars because when an item is received directly yo a work order number from a purchase order it does not create a WOMAT record. It's costs post directly to the WIP and RNI account, and writes a "J" transaction to INVTXN, and updates WOBOM, but no WOMAT. So, when you run the material issue report, the total cost does not match the total material in the work order.  
 
Can anyone tell me how the system is keeping it straight when you run Rebuild Work Order Costs? Does it add type "J" inventory transactions to WORKORDER, or to WOBOM, then update WORKORD material fields?