Frame connection missing its reference collection relation to the member system.
A frame connection is not related to its parent member system.
A number of problems will most likely occur; for example, you will be unable to graphically select the frame connection to get to the end of a member system.
What You Should Do
The frame connection needs to be removed and recreated.
Ask your database administrator to back up the model.
Supply all information possible that might have led to this situation, and submit this information along with the backup to Hexagon PPM Support.
Open the model.
Locate the offending frame connection, and delete it from the model.
Select the member part, and then click the member End on the member ribbon to re- create the frame connection.
Change the frame connection type back to the original connection type, and graphically select the supporting member to complete the frame connection modification.