Preserve original tax when appling tax rules

[albert (Albert Cervera i Areny)]

It is always the same in the case of IRPF, but not in the case of RE (Recargo de Equivalencia).

Here’s the list of taxes and replacements needed:

IVA 21% => IVA 21% + RE 5.2%
IVA 10% => IVA 10% + RE 1.4%
IVA 4% => IVA 4% + RE 0.5%

So in this case we must create:

• The standard IVA 21% tax
• The parent tax named “IVA 21% + RE 5.2%”
• A “IVA 21%” tax which is a child of “IVA 21% + RE 5.2%”
• A “RE 5.2%” tax which is a child of “IVA 21% + RE 5.2%”

So we’re creating 4 tax records where 2 should be enough.

Idem for the “IVA 10%” and “IVA 4%” cases.