...
Solution: The difference between Tax values in VAT Return Document and other Tax reports for the databases were when Tax groups are user used occurs because of the Tax groups ned need to be update each quarter.
Follow the steps to fix the issue.
1) Go to Taxes>Master Data>Tax Groups Taxes>Master Data>Tax Groups:
2) Open Tax group and go to History section:
...
This report now will create the VAT return for the updated TAX groups .and total amount in VAT Return boxes
Thanks for being a FIRST BIT customer!