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I am amending the default 'Purchase Order' screen to allow the tax code to be changed for each line item. However I can't see where the 'Total Amount' is calculated. After entering the line items and changing the 'Amount' to reflect the new tax code I hit 'Update' and the 'Amount' is reset. Then when I 'Save' the 'Total Amount' is updated with the correct amount after the tax code change.

Any pointers would be appreciated.

Hi andy, 

The Amount and Total Amount fields are calculated behind the scenes so you cannot change it. Unfortunately, it must be this way to sync and match up with Quickbooks. Hope this helps!

- Jason