Allright, think I got it.
I then triggered the action manually. What happened is that all dates of pending deliveries were set to today’s date. But this happens as well to those which can be delivered today (enough items in stock), as to those which cannot be delivered today (not enough items in stock). Is that what should happen?
This is what “Reschedule” action does.
You need to use the “Assign Customer Shipments” you get your items assigned. After executing the action you will see some shipments under the “Partially Assigned” tab. Those shipments are the ones that you have some stock items to be delievered. It is some because you may some of the items of the shipment but others not, so it is up to you to decide if you want wait the shipment or do a partial delivery.
Only shipments planned for today in waiting state are assigned. If you do not have any nothing is assigned.
Another option that may fail is that you did not add any company to the cron job. You should add there the companies you want to work on.
Ah, wait. They all were under “assigned”. So I put them back into waiting and ran the “assign customer shipment” wizard again. But none moved into “partially assigned”, although some could be fulfilled, only one moved into “assigned”, although I cannot fulfil that one.
So this seems not to be the same. It may be weeks ago that a customer ordered and I could not fulfil. But today there may be a supplier delivery - and now I can. Seems that there is no feature to get informed about this incident, if only pending orders of today’s day are observed.