I'm having problem re-assigning attributes of a risk work item to a new enumeration.
I managed to update attributes, add the new editors and workflow but I'm facing a problem with 2 custom attributes (probability, impact) of the risk work item.

Originally, the linked type for those 2 custom attributes were defined by the enumeration called risk (with values high, medium, low). Now for the updated risk work item, I want to relink those 2 attributes to 2 newly defined enumerations (impact and probability) so they can be used in the risk matrix. In fact they don't get relinked and are still showing the old enumeration values after I have modified the Type attribute to the new enumerations for both attributeDefinitions.
But when I create a new attribute to risk work item, the correct enumatrions are shown.

Anyone an idea how to get the new enumration linked to an existing attribute?

Thanks for the help