REG: class CL_PT_REQ_WF_ATTRIBS with custom method possibility

Dear all,

As you know under this class CL_PT_REQ_WF_ATTRIBS we have standard method approve now i want the same for reject method where we get the status as reject..I made the standard wf 12300111 to custom workfow.when i am making the standard class CL_PT_REQ_WF_ATTRIBS to custom and binding it getting error(Not compatible).Please guide me.appreciate your quick response.

can i see the custom method in the standard class.Any delegation process there.Any steps which satisfies my requirement.

Thanks & Regards

Sri.