Contribution override not generated

if we create a contribution override it does not appear in the JUCMNav editor.
grl ContributionOverride {
    softGoal A;
    softGoal B;
    B contributesTo A {name =C1;50;};

```
contribution FirstOverride {

    C1 = {start = 0; end= 20;step = 5; }
}

contributionGroup SomeOverrides includes FirstOverride;
```

}
