When we generate Packing slips from the Load it is then possible to Cancel them (Ship and receive tab, Cancel packing slips button).

Unfortunately, if we're using WMS but want to post Packing slip automatically, we have to run Sales and Marketing periodic function (Sales & Marketing > Sales orders > Order shipping > Post packing slip). In this case the Cancel packing slips button on the Load is greyed-out.

It would be nice to have a periodic in WMS module to post packing slip from "loaded" Loads automatically, to then be able to cancel them in case of need (customer cancels the order for instance).