Update AET fields using Rule engine

Hi,

We have added few Z fields in the Membership table (LOYD_MA_SPECATTR) and would like to update these using the rule engine.

I have added these fields in the Rule builder customizing for condition group MSH.

In rule modelling the F4 help for these fields is not available (though I have the help type maintained for this attributes).

Wondering if updating the AET fields using the rule engine is actually supported in standard. Do we need to use any BADI's?

thanks