Rounding difference between purchase order distributions and receipts

Hello all!  A customer has found an issue in Grants Accounting that appears to be PO related. 

We have a purchase order that has a line to purchase 8 large ticket items for $390,004.13 each, for a total of $3,120,033.04.  The line has two distributions.  Distribution 1 is for 6.64 of the items, distribution 2 is for 1.36 of the items for a split of 83%/17%.  When the commitment was created for the PO, 83% of the total, $2,589,27.42, was committed to award A while 17% of the total, $530,450.62, was committed to award B. 

As each of the items were received at different times, the user entered a receipt for each item separately by receiving .83 of an item on the first distribution and .17 of the item on the second distribution 8 separate times.  The amounts for each of these distributions were $323,703.43 and $66,300.70 respectively.