Colloquially, many know GTIN as a barcode, but technically, GTIN is the number found beneath the barcode symbol itself, and can therefore also be used for other technologies such as 2D barcodes and RFID tags.
Before you start creating products in GS1Trade Sync, it is important to understand how the product hierarchy is structured.
A hierarchy always contains a base unit. The base unit is the minimum unit in the hierarchy that has a GTIN (EAN item number), and this is regardless of the type and size of packaging.
For example, a hierarchy might look like this:
Base unit — a carton of milk:

Packaging unit — a box of 6 milk cartons:

You should always start by creating the base unit, and when you are done with it, create the colliery unit.
Pallet unit — with 12 boxes of milk:

If your pallet is not equipped with a GTIN (EAN part number/EAN-14 number), you can enter your pallet information into the packaging unit (collet unit).
In some hierarchies there is not a packaging unit, e.g. if you have very large basic units such as a 15 KG sack. In that case, there is only a base unit and a pallet unit.
15 kg dog food — packed directly on pallet without/with GTIN:

If the pallet is not equipped with a GTIN (EAN part number/EAN-14 number), you can also enter pallet information here. In this case, for example, 25 sacks are packed directly onto a pallet.

Others have hierarchies with many different packaging units where the base unit is the same. Therefore, always start with the base unit and press 'Create next package level' from the basic unit, if you havefor example a packaging unit with 6, 12, 24 and 48 pcs.
Some hierarchies have several levels, i.e. a packaging unit within a packaging unit. Here you create from the minimum packaging unit (+ create the next package level) the next size packaging unit. There is no maximum for how many levels you can have in your hierarchy.

Pallet unit is created, as mentioned earlier, only if one has a GTIN (EAN item number) on the pallet, otherwise pallet information is entered on the top unit of the item hierarchy.
A mix display contains at least two different base units.
Here is an example with 2 different yogurts — 4 pcs. blue and 2 pcs. pink.

The blue and pink base units must be created BEFORE the mix display is created.
If the composition of a mix display changes, for example, to 2 blue and 4 pink or the content changes from 6 to 8 pieces, a new mix package with a new GTIN (EAN item number) must be created. Remember to close the old GTIN (EAN part number) if this is no longer available.
Packaging units containing consumer units without a GTIN (EAN item number) shall be created as the base unit. Enter the field 'Net content', how many consumer units are in the box/carton.

Here is an example from GS1Trade Sync:

Keep in mind that:
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