Views:
Issue:
Receiving this Error in a payment journal.  Amount must be negative in Gen. Journal Line Journal Template name = ‘PAYMENT’, Journal Batch Name = “Your Batch Name”, Line No. = a number.

Resolution:
The issue is you have the document type for customers as a payment and it needs to be Refund.  The system is checking that if it is a payment and a customer it needs to be negative – and it is not.
The fix for this is to void each of these checks.  Change the Document Type from Payment to Refund…enter the check numbers back into the Document No. field and change the bank payment type from Computer check to Manual check.
Then you can Post