I went into the grey market.
presses NP9 then pressed NP* then sold 1 sectiod corpse.
seemed to work then.
trying to find the exact way to do it.
Money cheat didnt work for me until I went into grey market then hit the numpad 9 and then add or removed something from the sell list. You dont actually have to sell anything.
OK just tried this and it works a charm.
Basically you need to have 1 item ready to sell by pressing the right arrow next to it. Then you hit NP9 then just remove the item by pressing the left arrow.
voila... cash time!
I've also tried different variations in the grey market and it doesn't work either.