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If you loaded the other file from the IBM i then these two options do nothing.
If you loaded the other file from elsewhere then these two options will do as they state.
Think about it. If the file exists in the IBM i data base and LANSA says it is maintained by "OTHER" then LANSA won't maintain it, apart from LANSA's access to it - the definitions held in LANSA and the generated OAM. If it is changed outside of LANSA then it will probably need to be reloaded and the OAM regenerated.