How to link BSEG item to its corresponding BSET items?

Hi All,

I want to associate BSEG line item to its tax amount (which exist as multiple line items in BSET). I sum up the amount for each BSET-TXGRP but cannot associate to which BSEG-BUZEI does a BSET-TXGRP belong to.

Is there any way to get the tax line items (in BSET) of an existing tax document for a particular line item of accounting document (BSEG).

I know that,

BSEG-BUKRS = BSET-BUKRS

BSEG-BELNR = BSET-BELNR

BSEG-GJAHR = BSET-GJAHR,

but

BSEG-BUZEI <> BSET-BUZEI

also,

BSEG-TXGRP may not correspond to correct BSET-BUZEI.

I found 'CALCULATGE_TAX_DOCUMENT' FM which calculates tax amount as required. But the reason I cannot rely on this is because possible tax code changes could lead to different calculated amount than that of in the tax document.

I have been searching several posts and links but no where did I get any solution. Can anyone suggest any function modules to fetch tax data of a bseg line item instead of newly calculating it using calculation function modules?

Regards,

Priyanka S.