Transaction key behind selection parameter?

Movement type 101 has selection parameter WE101 setup. This parameter looks at transaction key BSX and WRX using the valuation class to derive the GL accounts. My question is without knowing this off by heart or checking the material document after, where in SAP can you check what transaction keys are affected by the different selection parameters that exist?

eg) Movement 103 has selection parameter WE103....how can I know which transaction keys will be effected?

Thanks!

Clayton