Hi Filip!
Thanks for your help!
I have done the trace and the problem is not coming from object S_RFC as I have an * in all the fields.
I am the responsible of the RFC User in backend and GRC system. So, I have added them the authorizations to work.
When I create a business rule based on a configurable Data Source, the ad-hoc query is run without problems.
So...any idea of what can be happening?
Thank you so much!!