How to remove commitment cost of closed PO

Summary:

Content (required):

1 PO--->1 line--->1 distribution ---> 10.5 QTY ---> 420 $ total amount ---> 10.5 QTY received ---> PO and Line is closed status --->Distribution line is delivered status

1 AP Invoice--->Above PO matched---> 1 line --->10 QTY ---> 420 $ invoice and Line amount ---> Paid

This created two distribution lines for this Invoice line ----> Dist1 ---->10 QTY---->400 $---->item cost, Dist2---->20 QTY---->20 $---->Invoice price variance

Now, In manage Project costs page, This two AP distribution lines are showing as actual cost. At the same time, In Manage Project commitment costs, 20$ commitment cost showing for the PO.

How to correct this, so that the commitment is cleared and shows up as actual cost in Projects. Also, the Invoice price variance is cleared from project actual cost.