The IXD2 enters the war February 1942 so your date in the parameters and your filter on the top of the Mission Editor must be Feb 42 or later.
You will get the same error message when you make a group if the lead ship enters the war in 38 and a ship you want to join that group enters the war in 41.
An example would be this:
Your map date is Jan 40 and the lead ship is a Large Troop which enters the war Jan 38 and a Empire ship enters the war Jan 40. You will get an error message.
To fix this edit the entry date of the Large Troop to Jan 40 and the Empire ship will then be able to join that group.
I hope this helps...
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