You can create item serial IDs using this program. You adjust the quantity of the unit pack, but not the item serialization level, to add the loose items. When the item inside the pack is serial- controlled; that is, serialization for the item is enforced in Serialization Control (3.17.24):

Use this program to create item serial IDs by leaving the Pack Code field blank. When the loose item that is contained in the pack is mandatorily serial controlled, you leave Pack Code blank then enter the number of IDs to create for the items in the Pack Quantity field.

Use this program to build serialized inventory—item Serial IDs—into serialized packs. When building serialized items into a unit pack, you add each loose item into the pack by entering the serial ID in the Item Serial ID field in the Inventory Data frame. You can use the lookup browse to view a list of loose items. The system performs an automatic transfer when the loose item is located in a different location.

When the unit pack is booked for a specific sales order, the system requires that the newly added item serial ID is also booked for the same master sales order.

When you build non-serialized items into a unit pack, the Item Serial ID field is disabled. You enter the item number, quantity, and lot/reference numbers when Item Serial ID is disabled.