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@Anonymous First of all the issue of what would happen if a shared parameter is defined in both a shared parameter and in a family only applies to all non-system families where you can add a formula.  As with anything else being transferred, I'd see the project information as overruling any in the project. Ideally, when trying to add a shared parameter controlled by a formula in a family Revit would give you a warning that the shared parameter is defined elsewhere.  It would then either:

  • Not allow the shared parameter to be added to the key schedule while controlled by a formula
  • (Preferred) Have additional warning dialogue text stating "If you continue _____ parameter will be overridden"  After clicking "OK" it would allow the parameter to be added and would add an asterisk to the model name or highlight the parameter field in some way, with the hoover text "this parameter is being controlled by a  key schedule".  If the family is edited or put in another project without that key schedule it will revert to having the shared parameter be controlled by the formula