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How can I edit the value of an attribute of entity B based on the prior selection of the attributes from entity A and C?

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Hi everyone,

I just started using Mendix  and am fascinated with the possibilities of it, but I am running into a problem now that I just don't find the answer to. 

This is what my Domain Model looks like.

So every player on a team can score (between 1 and 5) on a variety of skills (defined in Skillset entity).

What I am trying to accomplish now is to let the user change every 'Individual Skill Score' on every skill of a selected player. 

It tried doing this: 

And then in the Template View of Skillset I added a  reference selector for 'Individual Skill Score', but then the value cannot be edited. 
How can I accomplish that the value can be edited based on which player and skill is selected?


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