question

I was able to condense my code down to the following thanks to the references you provided:

/**Custom Code*/
Storage.Object current = ownerobject(c);
Object item = param(1);
Storage.Item(item).assignedSlot = Storage.system.findSlot("WHERE slot.slotItems.length < 1 ORDER BY slot.bayID ASC, slot.levelID ASC");

Moderator comment:

It looks like others are copying this code. It will not filter on the storage object 'current' where the assignment strategy sits, therefore can return slots for other objects. To rectify this you need to add to the WHERE clause:

AND slot.storageObject=$1

and pass in 'current' as parameter 2.