1. On the General Ledger distribution tab of the invoice, highlight the row that is the negative amount
2. Note the information, and then delete that row
3. Enter the negative amount in a new row at the bottom
4. Save and close the invoice
You can also delete the affected invoice and recreate it with the distributions set appropriately, as this may allow you to save normally.
If neither of these resolve the issue, contact Support. We are currently evaluating this issue.
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