Nomenclature of Standard Class Keys 
The example below explains the structure of class keys.

SAP_EHS_1010_001 |
Complete class key |
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Notes: | |
SAP_EHS ......................... |
Prefix SAP_EHS : all class keys shipped with the standard R/3 System feature this key |
SAP_EHS_1010 ............... |
Four-digit cluster. – The first two digits denote the shipment. Example: SAP_EHS_10 : standard shipmentSAP_EHS_11 : standard shipment Pharmaceuticals– The next two digits group classes according to their position in the properties tree. As a rule, all classes allocated to a node of the tree are grouped. Example: SAP_EHS_1010 : contains all classes of node Administration |
SAP_EHS_1010_001 SAP_EHS_1010_ 002 , and so on |
Serial number of all classes of cluster SAP_EHS_1010 |

In the standard system, substance characteristic categories have the same name as the class they are allocated to.