This RFE copied from Support request:
[ 1114830 ] Product, Substitute / Sales Order
The substitute tab is currently for information only.
We have a requirement to modify the Sales Order form:
On Sales order line
enter Product
available stock is below quantity entered
prompt user with list of substitute Products from the
Product tab that have available quantities, show search
key, product name and available quantity.
jjanke said: Well, that would be part of a ATP
(available to promise) system. So - it's more an
enhancement request at this point.
Depending on costs we could be prepared to sponsor this
enhancement.