This caused by how the discounts taken were designed to follow the payment document. The apply process is handled separately from the checkrun process. Specifically, when credit memos are automatically applied to invoices during the checkrun, the discounts taken for payment terms on those invoices follow the fully applied credit memo and move to history. The discounts taken on the partially applied or other invoices follow the check. Therefore, the resulting posting journals may have varying results, depending on whether that report shows the credit memo information in addition to the check information.
EXAMPLE:
Consider this scenario:
Payment terms: 2%
Invoice #1 for $100 (Discount $2)
Invoice #2 for $100 (Discount $2)
Invoice #3 for $100 (Discount $2)
Credit memo for $125 (Fully applied to Invoice #1 during the checkrun)
Total Discounts Taken: $6 ($2 follows the credit memo, and $4 follows the check)
Check = $169
The total discounts taken are $6, but some reports only show $4 for the discounts that follow the check. The discounts that follow the fully applied credit memo do not display on all the reports as follows:
Computer Checks Posting Journal - Shows all discounts: $6
Distribution Breakdown Register - Only shows discounts that follow the check: $4
GL Distribution Summary - Only shows discounts that follow the check: $4
General Posting Journal (GL) - Shows all discounts: $6