NSC | Resolve “Transaction Was Not in Balance” When Using a Reverse Tax Code on a Vendor Bill

A user creates a new reverse charge tax code for the UK and assigns it to a Vendor Bill. When saving or processing the Vendor Bill, NetSuite returns the following notice:

"Custom GL Lines Plugin error due to a failed validation of script output: Transaction was not in balance."

The tax code was configured with separate accounts for notional debit and credit, and the Custom GL Lines Plug-in was enabled for transaction types such as Bill, Bill Credit, Check, Expense Report, and Journal. The user wanted the reverse charge tax code to work properly on the accounts payable side and was also checking whether the same setup would work for accounts receivable transactions.