Why will Corel Draw not allow two curve objects to be combined?

I have combined many curve objects in the past.  In this case I select two curve objects but "combine" under object is not selectable.  Why? 

It would be nice if the tool would tell me that, but I see no way to get an error code or reason.

I am running version 21.0.0.638 on a current update of Windows 10.

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