Tax selection on Payables invoice but neither tax calculation nor tax line required

Summary:

There is UAE specific requirement that if payables transaction occurs between 2 UAE companies that belongs to same VAT group, a type of tax named "disregarded" will be applied.
Tax treatment will require selection of this tax on Payables invoice line in Tax classification code but as a result neither Tax line required on invoice nor any tax calculation or accounting required. We can assume it as if no tax impact on invoice at all, just reflection of Disregarded tax selected on payables invoice line for reference.
Right now we have setup tax but it generates tax line on invoice validation with 0% rate. but in actual we don't want any tax line generation nor any tax calculation on impact on our payable.