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Hello-
I am unable to enter a quantity on Sales Invoices. I am receiving the following error message:
Validation Results
Invalid function calls. Function reserved for external tax engines only.
Can someone please help with some guidance on how to resolve this?
Thanks- Bill
I got the same error when using a custom Tax Area code which was not properly setup.
If you have created a custom tax code, do a search for Tax Area and edit the Tax Area code to not use "Use External Tax Engine"
Hope that helps.
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