SAP FI, Defaulting of 'Tax Reporting Date' (BKPF-VATDATE) in FB01 t-code

As per SAP standard, Tax Reporting Date in Document Header section of FB01 t-code is being defaulted with Posting Date. Let's assume, you're required to enhance it so that it stops defaulting the value in Tax Reporting Date field or ,as an example, you want it to be defaulted with Document Date field value.
Note that below described approach is not supported by SAP standard, so I'd advise you to discuss the approach with your ABAP people.

SE18 t-code:
Enhancement Spot VATDATE_RULES with the BADI definition VATDATE_VALUES.
A default implementation: VATDATE_VALUES_DEFAULT_SAP

Create Z* enhancement implementation:

And add the following logic into it:

IF BKPF-BUKRS= 'this and that' then BKPF-VATDATE to be equal to BKPF- BLDAT when posting document through FB01, FB60, MIRO and VF01 t-codes.

That's about it :)