Modify key in Hashed table

Hi All,

I have hashehed internal table like this.

data : it_zawcumsetz like hashed table of zawcumsetz with unique key

KTONR_OPUS ZZ_AWC WAERS_OPUS.

I am geeting entries in table.

LOOP AT it_zawcumsetz into wa_zawcumsetz.

IF wa_zawcumsetz-zz_awc IS INITIAL.

wa_zawcumsetz-zz_awc = 'X'. "New value is * for

ENDIF.

MODIFY TABLE it_zawcumsetz FROM wa_zawcumsetz.

ENDLOOP.

i want to modify key value in loop.

Rather than append from wa to another internal table is not possiable.

Can anybody please tell me how to solve this pblm.

Thanks,