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After copying a network dataset from one geodatabase to another, the copied network dataset is unable to be opened.
The two geodatabases have different DBMSs.
DBMSs have field names that are reserved and cannot be used. When copying feature classes between different DBMSs, some fields may be renamed so that they are compliant with the reserved field names. The evaluators on the network dataset are not accounting for the renamed fields.
Before copying the network dataset, make sure that the feature classes do not have fields with names that conflict with the reserved names of the target DBMS: