When making the Merged Cybernetics Array. you are only allowed to make 10 per 24 hours.
Which is annoying but whatever.
If you abort the mission, then it counts as completing the mission.
I guess it's a mission editor bug.

It's an important and intentional piece of content. Line up 6 of your mates and show them how fun group manufacturing is! </sarcasm>

Once you accept any mission, it counts as an "attempt". If the mission is limited to 10 attempts in 24 hours, aborting halfway through would use up one of these attempts. Click on the mission info if you need to see the required components, but don't accept.

I agree it would be better if the mission only cut you off after actually making ten, but that is where she's at.

However, the manufacturing missions do persist across multiple sessions, so don't abort if you have to log out. If on the other hand you just had to do a hive skirmish to vent your frustration over the tedium of crafting, then you lose whatever you had delivered to the mission thus far.

Too bad you didn't simply buy a Milanar Master Computer when I had plenty to sell ;)
(Siepos and Prosus units are in stock!)

Not a bug. An 'abort' is counted as taking the mission.