This is going back to the old arguments which i feel originated with an obscurity in the manual;
188.8.131.52.........The level setting indicates the number of each type of support unit that the computer will attempt to provide to that particular headquarters unit, based on availability. For example, if the player sets "Support Level" to 3 the computer would attempt to provide 3 support units of each type, to include Armored, Anti-Tank, Artillery, Anti-aircraft, Rocket, etc.
That ending ",etc." Is the culprit.
If there were 3 categories of SU and we set the SU auto level to '3' then we should have 9 SU's in that Corps assuming they were available. the fact that we DON'T know how many categories of SU there are and that construction & pioneer SU's are somehow magically exempt makes the whole thing a farce.
Some of my corps have 10-13 SU's and some have none.. All set to default "3" for many turns.
I decided to close Pandoras box and use the manual method ;)
The different types of German SU:
The ones you have to handle manually
1. Construction units
The ones you can transfer for free (numbers at the start of Barbarossa)
1. Artillery (whatever gun, whatever calibre, whatever name), 124
2. AA (every AA SU, whatever type, with the exception of Flak Regiments from German cities), overall 128
3. SP guns (Stugs, JPz, sIG), 25
4. AT (37 mm), 5
5. Nebelwerfer (=German Rocket SU), 28
6. MG, 3
7. Bicycle, 1
Your SUs don’t seem to move? Then I would check the receiving end, which is your higher HQs. If they are locked they won’t take back the stuff you don’t need in frontline Corps. For the automated system to work, the setting at the beginning of your campaign should be 1/2/3 for Corps (whatever you deem appropriate), 0 for Amies, but 9 for Army groups, and 9 for OKH. After 3 or 4 turns all the unneeded stuff from your corps will be found there. And from OKH, redistribution as wanted/needed IS FOR FREE.
Attached my personal memo (modified from pompack). The amount of APs saved for more important things (leader reassignements etc) is amazing, just look at the numbers of SUs.