Cause

At an unplaced connection the specification of the function which is the source and / or target of the connection is missing. You have possibly deleted the placed source function and or target function from the schematic.

Solution

Possibility 1

1. Select the following commands: Tab Connections > Command group Connections > Navigator.
2. To locate the faulty connection, click the message in the dialog of the message management and select the popup menu item Synchronize selection.
   
   The connection is marked in the connections navigator.
3. Call up the property dialog of the connection. Then add the full device tag of a function existing in the project in the properties table at the Source property and / or at the Target property. Do not forget to specify the correct connection point designation separated by a colon.
4. Click [OK].

Possibility 2

1. Select the commands File > Extras > Command group Organize > Project > Command group Optimize > Compress project to remove data that is no longer needed from your project.
2. In the compression settings activate the check box Remove unplaced connections.

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If required, start a new check run.