Establishing Relationships in a Meta-Model: Troubleshooting .odesign File Errors

[imeneazouzi]

While examining the meta-model (Fig. 1), I want to establish a relationship between the different flows. I define this in an .odesign file, as shown in the images above (Figs. 2 and 3), but it returns the error displayed in Fig. 4. Is it not possible to create relationships using the reference, and if so, what should I correct to make it work?
Fig1

Fig2

Fig3
Here, I have defined a tool section in the .odesign file where I handle the creation of new edge for the class "Relation".

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Here, I have added the specification for the source and target.

Fig4
This error message suggests that there is an attempt to access a feature named relationf on an instance of ProductFlowImpl within your meta_model. However, this feature (relationf) does exist ;

[lredor]

Hello,
I'm not sure, but I think that the expression aql:self, in the ChangeContext statement, is wrong. It returns a ProductFlow. You should have an expression that return the Domain where the new Relation should be created in.
Regards,
Laurent