Currently when a Joint command is Locked in Inventor 2014, it is very easy to tell in the browser that the degree of freedom has been removed due to the locking procedure. The Show Relationships button also designates a Lock.
On the flip side a Protect of a Degree of Freedom is not clearly stated in the browser to a user. The only way to tell that a DOF is protected is to RMB on it in the browser and inspect the status. The Show Relationship button does not show a Protect status.
Here is the problem, if a user Protects a degree of freedom the next relationship that tries to remove the protected DOF will spring a generic error message about a failed relationship. Without knowledge of the Protected DOF, the user would start deleting Relationships in order to get the design to work or to adjust it. This would be either the originating user that created the design or another user picking up someone else's assembly and trying to work with it and running into frustration.
Solution: Icon references for Protect Status or more robust error triggering on a Protected DOF.

