out of command? help

[phoenix]

I will have to ask this question again, sorry, as I can't find the thread from when I last asked, years ago....

I'm playing Second Kharkov-alt, PBEM, and it seems there's no way that both 6th Army, in Kharkov, and 17th Army and First Panzer Army (both south of Slavyansk) can be within the command range of AGS. Worse, there's no way that all the Corps commanders can be within command range of 6th Army. Hence all these units outside command range, you would think, should have 'OUT OF COMMAND' written on them. But not all of them do, only some of them. Can anyone explain that to me, please? 

Second, does it have any effect when Corps commanders are out of the command range of their superior Army unit, and have 'OUT OF COMMAND' written on them? I realise that front line units can have supply and recovery effects etc when out of command range of their Regiment or Division, but I haven't noticed any effects from having higher HQs 'Out of Command'. Are there any? 

All help appreciated! Thanks.