Methods inside object types WORKFLOW

Hi workflow gurus

I am trying to implement my own method in a subtyped object type, my requirement is that

if a particular condition is true then a particular outcome should be active.

For example

begin_method mymethod changing container.

select * from xxx where fff = ccc.

case xxx-ggg.

when 'aaa'.

//I want the corresponding outcome to be active

when 'bbb'.

//I want the corresponding outcome to be active

endcase.

end_method.

these outcome should show up in my workflow step.

Can any of the gurus help me out on this.

Regards

Narendiran Rathinavelu