Item Associations can be specified at runtime via Application Interface messages.
The message will provide the child item type and the region ID where that item is the:
Next item to exit the region and
Item ID of a parent item (serialized item) the child (serialized or non-serialized item) is to be associated with.
Serialized Items may not be child members of an association.
Warning: The association of a non-serialized item to a serialized parent item can become corrupted or lost in the following three ways.
If a sequence error is detected for a non-serialized item in a region where the item has an associated parent Item.
If a non-serialized Item crosses a PRT service boundary and the PRT process for the first service is unable to provide the parent item data for the non-serialized item.
A non-serialized item has an associated parent item and the non-serialized item is placed on an item carrier with another item of the same item type.
PRT has no way of re-associating the Items when an association is lost except through a manual user transaction.
1. Items: defined.