The taxes calculated on booking can be different from the taxes applied on the vendor/client invoice as when the items are added to invoice, the system calculates taxes based on the tax rules applicable at that point in time.
Even when the taxes are overridden on booking level, when the booking is added to the vendor/client invoice, the invoice recalculates taxes based on tax rules and the overridden taxes are ignored.
The application although specifies that the nominal taxes were overridden on the vendor/client invoice item when user review items added to the invoice records.
please see below example:
If users need to adjust the difference of taxes in some special cases, one method is by overriding the field of tax payable or tax rate to reach your expected tax amount manually.
Please note that the manual adjustment rate cannot be over than the specific tax setup in system, otherwise it will be failed to save.