Question about part relations

I have a relation "d1=d0" between 2 features. If I change d1 from 0.1 to -0.1 and regenerate the dependent feature stays the same: i.e. it stays at 0.1. If I click on the feature >Edit, the dimension I changed to -0.1 shows up as 0.1, but if I go into the feature with Edit Definition it still shows as -0.1. I think this must be behind the problem as the relation is at the part level, between two features. How can I stop this from happening?
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