Extract "Pay Scale Group"

I need to extract the "Pay Scale Group" of the employee fro some deciion making within the Workflow.

what i figure out is that i need to call

Two Methods GETLIST & GETDETAIL of object BASICPAY.

The Method GETLIST gets called successfully,

but i'm not able to call the METHOD GETDETAIL of object BASICPAY.

What i found is that The BINDING of GETDETAIL doesn't list all the Import variables of FM 'BAPI_BASICPAY_GETDETAIL'.

IF thers is any other way to extract this information.

I'm new to this Workflow stuff. so please guide me if i'm on a wrong track.