I have got the SAP availability check "A" for create sales order set up exactly as I need it to work. When I create a new sales order it correctly identifies the availability based on other existing dependent requirements and reservations.
However immediately after creating the sales order if I go into change sales order, whilst the checking rule used is the same, the dependent requirements and reservations are ignored and the confirmed date is brought forward. I have looked in CO09 and I can see that the difference is that the "with requirements quantities" box is not checked at sales order change, only at sales order create. I have also looked at the configuration for the checking group, - OVZ2, and the accumulated quantities settings here make no difference.
Is this normal system behaviour, or am I missing something ?
Any help appreciated.