Required ECExpression SymbolSets - OPM Connect Edition

Hello Everybody,

We trying to follow a couple of Wikis for OPM Connect Edition (7) e.g. "How To Add New Property and Define A Calculated Formulae in that Property" or "How to Display Elevation Differences using EC Annotation in OpenPlant Modeler", but for the ECExpression I am not able to add required ECExpression SymbolSets, like it is described in the article.

I have no options to add. Please see attached a picture of the Calculated ECProperty Spec. in OPM CE (7):

Like it is described in the article (probably for v8i):

Any concerns, what to do, or to add?