How do packaging levels work in GSDN?

The packaging level need to be set per packaging element in GS1-GDSN. The packaging level is directly linked to the trade item hierarchy level.

Packaging level	Description	Applies to trade item hierarchy level
1	Primary: packaging developed as a single consumer sales unit	Base Unit or Each Pack or Inner Pack
2	Secondary: this is a grouping of several primary packs. Often this is a trade unit or outercarton	Case
3	Tertiary: packaging for transporting sales units	Pallet Display