Dynamics Ax - Inventory Valuation (Weighted Avg) - WIP Over Valued

Dear All,

Can anyone help us to guide the Inventory Valuation Methodology (Weighted Avg). I have tried number of times but not able to get the expected result.

system is calculating overall purchase at the time of production closing and change the earlier Issued value also which we expect that it should not change otherwise WIP Inventory will be over valued.

I have tried to explain the situation with below example.

  Total Prod Order requirement = 22 

Activity Date Qty Item Rate Total Issued 21 nos dtd 15.7.13 @ 103.33
Purchase 13-Jul 10 100 1000 Issued 1 no dtd 17.7.13 @ 114.75
Purchase 14-Jul 10 100 1000 @ Production Ending
Purchase 15-Jul 10 110 1100 Expected WIP System Generating
Closing 15-Jul 30 103.33 3100 Prod Status
Issue 15-Jul 21 103.33 2170 WIP Prod Order Open 2170 @ 103 2283.75 @ 108.75
Closing 15-Jul 9 103.33 929.97
Purchase 17-Jul 10 125 1250
Closing 17-Jul 19 114.74 2179.97
Issue 17-Jul 1 114.73 WIP Prod Order Close 114.75 @ 114.75 108.75 @ 108.75
Closing 17-Jul 18 114.73526 2065.23 Prod Close Value 2284.75

2392.5