First compile your schematic. Compile does a check against all design rules.
Next, open the "Messages" panel. The errors found during compile will be listed there. Look for an error regarding your output pin.
Finally, to disable the check that is causing the wavy line - go to Project>Project Options>Connection Matrix, and change the check that is causing the error to be flagged. From the schematic above, I believe you have your matrix set to flag an error if an output pin is connected to a power pin.
There is also another way to supress the error marker - go to Place>Directives>No-ERC. Put the 'X' on the output lead. Go to Tools>Schematic Preferences>General and uncheck the box next to "No-ERC Markers". Now you will see a No-ERC "X" on the screen display, but when you print the schematic there will be nothing but your connections.