Function module import parameter....Urgent

Hi Experts,

I am using User Exit M06E0004 which is using <b>FM EXIT_SAPLEBND_002</b>. It has 4 inport parameters

I_CEKKO LIKE CEKKO

IT_BEKPO TYPE MMPUR_BEKPO

IT_BEKET TYPE MMPUR_BEKET

IT_EKKNU TYPE MMPUR_EKKNU

and 1 export paramenter E_CEKKO LIKE CEKKO

I want to pass 1 more field MDSB-matnr(character type matnr for BOM child Items) which is not in any the structure here.

Its a standard FM so we have 1 include for enhancement in this exit. So what to do to get values for this. i need this matnr against a PO in CEKKO.

I need to do all this for my requirement of IDOC. I have to send IDOC when any subcontract PO release and having Child Items(BOM materials MDSB-matnr) started with 'P'.

Regards,

Nik