The function number: N/A
The complete error text: N/A
The window affected: N/A
What you were doing at the time: I constructed a over 1 million ton mining station via my industry that has attached 50,000 tons of cargo space and a cargo shuttle bay, upon its construction the mining station was automatically assigned to a civilian freighter, the freighter in question had no tractor beam system and yet it was successfully transporting my mining station away from Earth.
Upon detaching it from the civilian ship and tugging it back to Earth, I noticed it had 20 units of Industry loaded, I tried to unload the industry and load a single mass driver, yet I continually return a 'pickup order failed', and it will not unload the industry.
I saved my game and created a second mining station, the second station did not attach to a civilian ship, and was able to load/unload ground buildings without issue.
Conventional or TN start: Conventional
Random or Real Stars: Random
Is your decimal separator a comma?: No
Is the bug is easy to reproduce, intermittent or a one-off?: It appears to be a one off.
If this is a long campaign - say 75 years or longer - let me know the length of the campaign as well: Campaign is 91 years in.