How are the fields in the VAT statement effectively calculated?

Reference 200 – Total revenue (Reference 220 + 302 + 312 + 342)

Reference 220 – Customer invoices with 0% MWST

Reference 289 – Amount from reference 220 automatic calculation

Reference 299 – Total reference (Reference 200 – 289) automatic calculation

Reference 302 – Customer invoices with 8.1% MWST

Reference 312 – Customer invoices with 2.6% MWST

Reference 342 – Customer invoices with 3.8% MWST

Reference 399 – VAT amount - (Reference 302 + 312 + 342) automatic calculation

Reference 400 – Supplier - amount 100%, 8.1%, 3.8%, 2.6% MWST
Manual entries - Account 4000 – 5999

Reference 405 – Supplier - amount with 100%, 8.1%, 3.8%, 2.6% MWST
Manual entries - Account 6000 – 8999

Reference 479 – VAT-Amount (Reference 400 + 405) automatic calcualtion

Reference 500 – Amount payable to the Federal Tax Administration (Reference 399 – 479) automatic calcualtion

Reference 510 – Credit balance of the taxable person (Reference 479 – 399) automatic calcualtion

ACHTUNG: Amount is calculated on either Reference 500 or Reference 510. Both fields are never calculated.

How are the fields in the VAT statement effectively calculated? ​