You are calculating tax with the "tax included" in the price, and also have a discount that is a flat amount, but the calculation does not seem to be working.
- When calculating with Tax Included, we are unable to update line amount using a flat discount amount
- To calculate with Tax Included, we need to update line amount to match the subtotal on the transaction.
- NetSuite does not allow updating line amount when there is a flat discount amount on the transaction (instead of a percentage discount)
- The amount due can exceed the tax inclusive amount, there is no workaround for this issue due to limitations within NetSuite