Bapi/FM to update HU Group 5 in Humo transaction

Hi Guru's,

I am looking for FM/BAPI to update HU Group 5 Field which is in the Additional Data in the transaction HUMO.

I found some FM which is used for updating the HUMO transaction.

But I need some idea how to update the particular fiels HU Group 5 in HUMO transaction.

Thanks and Regards,

Ragunath