SAP CRM Product Catalog Main Tables are listed in this posts. Use the following tables as a reference when looking for the exact SAP CRM Tables when dealing with SAP CRM Product Catalog Data Model.?
This article will cover How Sap Classification is handled.
It starts with SAP Characteristics and Classes Customizing to get an overview of Classification.
The second part is more technical and covers the Master Data for Classification (ex: AUSP).
The last part explains how to handle Characteristics in ABAP Coding: How to read and Update Characteristics.
You will find a link to ABAP Program Update characteristic value in Sap: how to update the SAP Customer Classification.
This code will update characteristic value in SAP.
First, it checks if the characteristic is already exists or if has to be created.
Second, it updates the characteristic value.