Use of the Supplier Item Field - Purchase Agreements

Summary:

What's the use of the "Supplier Item" Field in Purchase Agreements ?

Content (required):

Hi, I would like to use the "Supplier Item" Field at Purchase Agreements :ine level , but before that I would like to know what it is for initially used for ? Is it related to Punchout Catalogs ? How can I find this type of info ?

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):