what is the selection criteria used by the tax register and how is it different from invoice registe

Summary:

We are trying to file our purchases and have seen that not all the invoices in Payables are visible in tax register for a given period of time.

We tried running an extract of invoices with invoice date for March and then ran Financial tax register with parameters selected as below.

However, the reconciliation is not matching and we are wondering whether there is a specific criteria with tax register?