Auto unique number for Object ID in Ibase

Hi Experts,

I have a requirement where in a field OBJECT ID in NEWOBJECT view of IBHIER component i.e creation in IBASE and the fiew should get a populated any unique number when said create .

I wrote code in DO_PREPARE_OUTPUT method for the output but stuck how to generate unique number to the field for every click on the create.

plz provide some code how to populate and input field with some unique number at every creation.

thanking you very much,

Sree.