BRF+ Message Log & "Rule as Expression"

Hi colleagues,
I am quite new to BRFplus and have two questions:
1) I would like to use a message log action in order to indicate errors. I tried to follow https://wiki.wdf.sap.corp/wiki/display/FDT/Message+Log   with method SET_APPLICATION_LOG_OBJECT, but I can't find the class this method belogns to. I also tried modelling a rule & action message log with help of the UI. My question is how can I log messages and where can I find them after the function is beeing processed?
2) In every guide I can read something about rule expressions and even how to create them (e.g. http://help.sap.com/saphelp_nw70ehp1/helpdata/en/cc/85414842c8470bb19b53038c4b5259/frameset.htm), but in the workbench there is no possibilty of creating rules as expressions but only rules and rulesets (the rule is not part of the "Expression" node).
I hope somebody knows what I mean
Thanks a lot & kind regards,
Ilijana
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Thanks a lot for your response!
Could you tell me why using rules and rulesets is not recommended for 7.01 ? This could be interesting for my bachelor thesis.
Thanks & Kind Regards,
Ilijana