Start a '41 campaign Human vs. Human, all normal. Run until start of turn 4 (just press end of player turn 6 times). The production screen, filtered to GE, should the look like the one in the first picture below where there have been built 40 47mm AT and the ARM pool is down to 160k. Take a ss if you like.
The quit game, back up your dat folder (ignore this at your own peril!), restart and enter editor. Load generic data and find ground element with ID 357 (pic below) and change build cost from 9999 to 19 (same as 50 mm AT-gun) and save. Exit editor, start new game and run until start of turn 4 as per before. Bring up production screen and compare with values from first run. My trial (pic further below) shows 231 units of 47 mm AT-guns built (yes this is a-historical since it is captured equipment, hence the 9999 cost), but the key data is the ARM pool that has 555k available.
Conclusion is that in the first run the 40 AT-guns built consumed 400k ARM (10k each).
So there are some possible bugs:
1) Ground element production consumes ARM instead of SUPPLY (so fixing this should increase supply usage, which is currently sought after per a comment by Flavius). Check a GE rifle vs a Cav - almost the same but for the horses which should cost SUPPLY not ARM.
2) The "do not build" check is not working - I assume cost equals 9999 should mean "do not build".
3) Devices should have a cost in ARM.
/g
