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When an order had Item discounts, the calculations for Early Payment and Volume discounts were not correct.
Fix issues with rounding of amounts in the AR transactions with invoices that have 3-digit pricing and only 1 lens is manufactured.
Invoices
When an invoice uses separate lines for left/right lenses, the prices were not correctly rounded. For example, a pair of lenses is priced at $39.95/pair, they appeared on the invoice as $19.98/each, which is a penny more than the actual price. The prices now appear as $19.98 and $19.97, reflecting the true price for the pair.