Mobhack has a help file - reading that there is a short bit on the bad ammo message.
Quote:
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Bad Ammo- This check finds units that may be assigned ammo it is not set up to use ( for example a tank may be assigned HEAT ammo when there is no HEAT listed for that weapon ) OR assigned ammo to a weapon slot that is not being used
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That coule be anything - say an aircraft weapon used by a ground unit. Or a HEAT round without a 222 code being used in a non-slot 1 AP slot.
It would be helpful if you said which unit number, in which OOB tripped the message as otherwise we are completely in the dark without the slightest hint where to look.