Rounding off difference of calculated tax in po and in invoice

Hi,

We have an issue in the rounding off of calculated unit cost and tax in PO and in invoice.

For example, an invoice is billed with the total amount due of 25,483.10 inclusive of tax (2,730.33). Tax rate is 12%.

During the PO processing, the quantity is 4 and unit cost is 5,688.191964 ((25,483.10/4)/1.12), tax was setup using standard inclusive handling. Then, if we are to click manage tax in the action sub-menu the calculated unit cost and tax per line was 5,688.19 and 682.58 respectively. With this amount, the total would be 25,483.08 ((5,688.19+682.58)*4) with the difference of .02 (25,483.10-25,483.08). With this .02 difference we cannot proceed with the PO/Receipt matching in the Invoice. Is there any setup in order to prevent this rounding off issue in PO during tax calculation?