functional module CALCULATE_TAX_FROM_NET_AMOUNT has import parameter i_prsdt , which is a date for calculation of tax.
Although this field is not mandatory, but to get correct value I have to use it.
I am using this function in customized report for invoice open items using tcode FOYB.
I am unable to find 'Calc From Date' in SAP table with suitable key.
Although there exist a table VIBEPP and field is DBERVON.
It has key fields IMKEY , DTRANS, TTRANS, NTRANS.
I have value of IMKEY but don't know how to find value of DTRANS, TTRANS and NTRANS.