BAPI extention to work order aiming AUFK custom field filling

Hi to all,

I'm actually operating with BAPI

BAPI_ALM_ORDER_MAINTAIN,

among several updating using within structure BAPI already provide, I'm willing to update a custom fields spotted and visible in tabstrip Extension inside IW33 transaction,

It's a custom field rowed within an append structure in table AUFK, wich I would like to get updated througout the Extension bapi's structure,

'I found along dictionary the structure 'BAPI_TE_AUFK wich i

could use to reach my aim,

Sneaking around forum I also picked up some example

on how to feed the Extension structure to get BAPI

updating my AUFK z( field),

Real problem is I don't have in Dictionary the corresponding structure as BAPI_TE_AUFKX to gain BAPI_TE_AUFK updated....,

example:

it1_bapi_te_aufk-zzfield1 = wa_data-ebeln.

it1_bapi_te_aufk-zzfield2 = 'X'.

it1_bapi_te_aufk-zzfield1 = 'X'.

it1_bapi_te_aufk-zzfield2= 'X'.

How should I solve that?

What a should get to do in order to have the twin structure x

available and globaly the BAPI sensitive to may zfield in AUFK?

Thanks a lot in advance to any help anyone could use,

Sergio,