Just added to my notes, I think I finally understand the error message;
"Unit's date of commission is later than leader's entry date"
and more importantly, what to do about it. Tried changing entry date on the group leader, the ME obstinately changes it back, so that doesn't work.
Trick is to place all the different units in formation, then select the one with the latest entry date, use that one to create a new group. It looks weird on the ME map to have the lines from all the ships going to one in the lower left corner, but it works fine in game, the leader of the group doesn't actually need to be whatever ship is at front center in the formation.
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