I have several customizable entities where I want to change any datetime attributes to show date and time instead of date only. I have been able to do this for some entities through Settings > Customize Entities > Attributes section of whatever entity I'm customizing, but there are about two dozen entities where most or all attribute property fields are disabled, so I cannot change the setting that way. I have tried to export the customizations, changed the appropriate XML fields, and imported the changes, but this does nothing. CRM will say an import was successful, but no values have changed. What am I missing here? Some of the entities I'm trying to customize are Activities, Currency, Report, etc. Is there some sort of lock on these entities or are they disabled forever and forever? What am I missing?