Adding additional item lines to accounting document

Hi All,

We have a specific requirement for adding additional line items in accounting document while posting from transactions like FB01, FB50 and MIRO.

First we tried the BADI 'ACC_DOCUMENT' but its not triggering from the above Tcodes . It can only be triggered from BAPI.

Then we tried the BTE 1120. But the table parameter T_BSEG, which we used to add custom lines, is replace by L_BSEG,internal table with original lines, after the BTE call.So We could not use these two methods for our requirement.

I  think Substitution is useful only to replace the fields of original lines not to add new lines.

Please suggest a suitable solution for this requirement.

Regards

Suniljith