Take a look at the I/C - Setup - Options - Documents tab. The Adjustment number is always incremented by the next number.

when it is posting the inventory rec, it tops out at a certain number of lines. I think it's 100 but can't remember. so it makes additional adustments if you need more line and adds a -1, -2, -3, -4..... and so on to the end of your reconciliation number. if it crashes though, due to an error, and you try to restart, it will probably hit that same number again, so whenever I have to restart, I put a "-A, -B, -C..." at the end.

One thing to save yourself some headaches though, before you post, you should be looking at the inventory reconciliation printout and look for any statuses that indicate anything other that "ready to post". If you have items that didn't have a cost it might not say "ready to post" in which case it will cause an error. if you fix those ones first before you post, then you will have less problems. I altered that print spec to sort by that status so they all show up at the end rather than having to scour every page.

Excellent feedback and advice.
Thanks for that!