Global Trade Item Number (GTIN) 

Definition

Technical name: COMM_PR_GTIN

The Global Trade Item Number (GTIN) is a 14-digit number which includes various EAN/UCC numbering structures and is used to uniquely identify a product worldwide. EAN/UCC product identification numbers allow a unique identifying GTIN to be derived in the System. All EAN/UCC numbers are considered as 14-digit numbers, right justified and zero filled where necessary.

Usage

A GTIN can be assigned to a product provided the set type GTIN is contained in a product category and the product concerned has been assigned to this category. A GTIN is assigned to the product together with a unit of measure. As more than one unit of measure can be maintained for a product, this means a product can have more than one GTIN. A GTIN should only be assigned once.

In Customizing for Cross-Applications Components, you can specify what should happen if a GTIN is assigned twice. For this you create a new entry under SAP Products ® Basic Settings ®Define System Message Characteristics. Enter 001 (GTIN has already been assigned) in the MsgNo field and specify which type of message should be output in the fields Online and Batchl. If no entry is made for the message, a warning is output by default if the user attempts to assign a GTIN that has already been assigned.

You do not want the same GTIN to be assigned more than once. You then make the entry:
Message number = 001, Online = E, Batchl = E