I have UN created with one domain network in it. have few subtypes created in each featureclass with assetype of each subtype having one domain assigned. If I want to change coded description of one these domins, idelly I should do 'remove domain from field', edit+save the domain and again 'Assign domain to field' should assign it back. In reality, 'Assign domain to field' fails to assign it and throws error as below:
ERROR 001987: The domain is required by utility network and cannot be deleted.
If I revert the changes made to domain and reassign it,it works normally which is strange.