GeertBellekens
commented
7 years ago workaround is to create the required result in the subset and give the resulting association an "ignored" stereotype. That way you only need to specify how you want this to work and all future re-generations will honor this. (without the stereotype the association would be deleted as it isn't present in the source model)
In case of an XSDChoice element in the subset that only has one element to choose from the XSDChoice element can be deleted and replace by a direct link to the remaining element Example:
The result should then look like this:
The relation between the choice object and the final object should be rerouted to the source object. The choise object should then be deleted in the subset.