Problem:
VAT amount is not applicable in documents (invoice received as an example:

Solution: to check VAT rates:
-Go to Taxes module, open list of VAT Rates and select the one, for example, 5%:


-Make sure that the Rate field is filled in and there is not a zero (0):

- Make sure the selected rate type is logically correct. For example, a 5% rate cannot be marked as Out of Scope or Export, so these options should be disabled:

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