I have successfully had a colony ship built at one shipyard move to another planet, load population, and colonize a third planet in simultaneous without any orders being cleared.
In solo games, I have seen orders clear when a fleet tries to load cargo, and some of the escorting ships in the fleet have no cargo space, which gives an error warning box for each ship.
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Cap'n Q
My first mod!
Hypermaze quadrant
The most merciful thing in the world, I think, is the inability of the
human mind to correlate all of its contents. We live on a placid
island of ignorance in the midst of black seas of infinity, and it was
not meant that we should go far. -- HP Lovecraft, "The Call of Cthulhu"