( Alnivel pointed out that error to me. )
I add some cargo-space via oxp/script to a ship.
-- with my Imperial Trader -- all works fine ( the ImpTrader is not allowed to carry a large_cargo_bay)
-- with a cobra MK1 - i use for testing - after save & load --a large_cargo_bay(LCB) is installed.

hmm -- never bought this.
--> ok - LCB sold - got some money
--- save/load - the LCB is back
Hey!!! -- I found a money-making-machine!
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Does somebody has an idea how to prevent the (wrong) installation of a LCB.
( or to remove that beast - automatically )
Matthias