Do obj.write({'credit': res[0]['credit']}) !

Make sure your obj is pointing to self pointer which is the browse()!

Thanks.

Hi,

In old api we need to pass (cr, uid, ids, vals) this 4 arguments inside write() method.

But here you have only pass (ids, vals). You also need to give as like below.

obj.write(cr, uid, [obj_ids], {'credit': res[0]['credit']} ) # if obj_ids is not an list object. otherwise just put obj_ids without [ ].

If you want to use new api and your "obj" variable is browsable object then just make calling as like

obj.write( {'credit': res[0]['credit']} )

Hope it will resolve your issue.