Cause
You added a device which you defined as a part with defined function templates (device). In doing so, you place less functions than the corresponding part has.
Solution
Possibility 1
Select a part with the corresponding function template entries.
Possibility 2
Reduce function template settings for the selected part in the parts management. To do this, select Utilities > Parts > Management, and in the Parts management dialog, select the Function templates tab. In the table, highlight the function templates you want to remove and click 
(delete). Copy the changed setting into the parts management. Then place the device in the schematic once again.
Then start a new check run.
Note:
Whether this message is issued depends on the Minimize unused functions and Number of unused functions settings. You move to the settings by firstly opening the Properties dialog of the device, bringing the Part tab to the front and clicking the [Device selection] button. In the Device selection dialog then click on [Settings] and open here the Settings: device selection dialog with the setting options previously stated above. Using the Number of unused functions setting you set the number of functions not used in the device (reserve functions) that the part should provide. The number can only be set if you have selected the Minimize unused functions check box setting.
If the Number of unused functions setting is set to "0", all unused templates will be identified as error(s) found.