Subcontractor Entries Doubled up In Nav 5.1 Manufacturing

Hi Forum, can any one shed any light on this problem. My client Created a Production Order which used a Routing with 4 operations. The 2nd and 3rd operations involved subcontractors. Using the Subcontractor worksheet, the Purchase Orders were created and completely posted and then the Production Order was finished. On looking at the Value Entries and drilling down on the Direct Cost Account, the subcontractor entries have doubled up and I cannot see why. Can anyone help please. Thanks Paul

The problem was caused by the fact that the work centres for the subcontractors have a Flushing Method of Backward. Change it to Manual and the values nolonger double up.