I believe it is an error that only happens when you have losses on T5008. In my case Box 1 on Chart A in T936 is a negative number (as it should be if you have capital losses). My suspicion is that if you read the description for Box 1 Chart A if it is a negative number it is not supposed to show as a negative number but as a number in brackets. My suspicion is that by Box 1 not populating correctly in brackets the remainder of Chart A (including box 68140) does not populate.
