Topcased is a couple of years out of date so a bug may be fixed in Papyrus.
I recall that similar problem was associated with modifying UML at the
wrong level of property subsetting.
On 22/10/2013 14:37, Tomas Sandkvist wrote:
> When I add a parameter to a signal I get the following error:
> The opposite features 'feature' of '<Signal> Nisse' and
> 'featuringClassifier' of '<Property> parameter1' do not refer to each
> Also, the parameter is not displayed in the properties compartment of the
> Signal element. Why this, am I doing something wrong or is this a
> limitation of the Papyrus editor or SysML implementation?
> Using a SysML block diagram in Topcased.
> Tomas Sandkvist