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Create Differential Pair grayed out in OrCAD Capture

Fredda

I have a number of differential pairs in my design, which are created in Capture from Tools->Create Differential Pair. I was going to create another pair and noticed that the menu item is suddenly grayed out. 

When looking into the Constraint Manager I could also see that the pairs I had created earlier were "broken". All I know is that I was flipping a CM choke in the pair and adding some new net names.

DP1+ and DP1- were originally a diff pair. I then flipped the choke (1 <-> 4 and 2<->3) and added the DP1_CM+ and DP1_CM- net names. Well, something like that. Anyhow, in the Constraint Manager I can see that DP1+ and DP1_CM+ are now suddenly defined as a pair. What is going on here??

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