Update sales order configuration while creating sales order

Hi all,

We have a business requirement to be able to update the sales order configuration after the material availability check is complete, but before the sales order is saved. I haven't been able to find a user exit specifically for changing configuration.

I tried USEREXIT_GET_FIELD_FROM_SDCOM and FM CUCB_SET_CONFIGURATION. As far as I can tell, while I'm still in the user exit (in debugger) the config. is changed. However, once control is returned back to VA01 and I try to look at the config, my changes are gone.

Any ideas how I can populate a characteristic during sales order creation based on the material avail. check?

Thank in advance. As always, points will be awarded for helpful answers.