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Joined: Aug 2007
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I've just checked and POBs should accept the volume increase without any trouble.
If the cargo limit is exceeded, you won't be able to sell anything else to it until it's back under the limit again, so you may want to refine or remove the Ore before it interferes with upkeep supplies.
For ships, its possible that undocking with too much cargo would trigger the anticheat and result in a kick. For safety it'd be best to sell the cargo pre patch, or to the station you're on before you undock.