You may not create sketch or family constraints between group members and elements which are not members of the same group.

public static FailureDefinitionId ForbiddenGroupConstraint { get; }

Public Shared ReadOnly Property ForbiddenGroupConstraint As FailureDefinitionId
	Get

public:
static property FailureDefinitionId^ ForbiddenGroupConstraint {
	FailureDefinitionId^ get ();
}