Sales Tax Calculatoin 1 Penny off

Hello,

We are on Oracle R12, we recently began doing business with a supplier through EDI and the invoices are going on Line Variance hold due to a 1 penny difference in the sales tax calculation.  Our AP team is having to go in to hundreds of invoices daily to correct the penny error.  We have been researching E-Business Tax and looking into the Tax Tolerance, but that appears to only be a rule applied to the manual entries being done.  Has anyone else had the penny issue and how did you resolve it?