Tax code mapping with statistical key A

Hi,

We want to mapped tax code to statistical key A (Down payment request).

All the required configuration seems to be in place. (Attributes - division level level mapping, EK02, FQZG and FQZB)

Issue that we are facing is that for tax code we have three transaction keys (meaning posting to 3 different GLs, posting area 0010) (i.e.service tax, cess and H.E. cess).

As I understand for triggering tax clearing (dwon payments) - Posting area 0020, there is list of ley combinations as belows for each Offset tax acct

Company Code

Down payt acct

Tax code

But as you can see, we need combination of transaction keys along with tax code as we have single down payt acct so system takes only single offseting account against tax code whereas we have 3 accounts.

Because in the absence of this, I getting error of FM - FKK_TAX_DATA_COMPLETE.

So is there is any event where we can extend this combination to resolved this issue.

Regards,

Paresh