OSRMT allows to delete artifact types from the UI.
Here are the steps to reproduce:
1. Create a new product.
2. In main UI, select "Feature" artifact type.
3. In menu, select "Edit" => "Delete".
Then the product becomes unusable. You must close it
and re-open it to get the artifact types back.
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user_id=1601686
I've entered the defect (Luc Spenard)
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user_id=1500174
Fixed in version 1.3