Regarding Project Invoice relation to TaxTrans

Hello Community,

I want to know how the Project Module is integrated with TaxTrans.

I am aware that LedgerVoucher is something which ties them up however if I want to know the line level tax (either for Hour/Item/Fee/Expense) then I can see only <TaxTrans.SourcerecId> to be unique at line level.

However I want to know how this <TaxTrans.SourcerecId> can be used to identify the <ProjectId>, <ProjectContractId> etc..

Thanks in Advance.

Regards,

Alok