Solution : https://service.sap.com/sap/support/notes/945038 (SAP Service marketplace login required)
Summary : 
      When attempting to use the "Registration (Company-Specific)" value assignment type under the Product Safety component for substance volume tracking in SAP, users are unable to access this function in the specification workbench. This issue arises due to a lack of necessary classes and characteristics in the system—specifically, SAP_EHS_1023_057 and related classes have either not been delivered or improperly customized. To resolve this, users should import the provided transports, AERK026553 and SH9K003919, which include all necessary classes and characteristics in multiple languages. Ensure customization for the new value assignment types and update the property trees and phrase sets accordingly.
Key words : 
sap_ehs_1023_057 sap_ehs_1026_001 sap_ehs_1026_002 sap_ehs_1026_003 sap_ehs_1026_004 sap_ehs_1026_005 sap_ehs_svt sh9k003919, store company-specific registration data, terms internal program error, sap_ehs_1023_057 class assigned, substance volume trackingyou, substance volume tracking, saplc1ax rmwbpwb0 0 charact, class/characteristic assignments, missing characteristic reason, company-specific
Related Notes : 
       
| 1271733 | Release information note for SAP REACH Compliance 1.1 SP02 | 
| 1173789 | REACH: Substance volume tracking - Integration w/ REACH 1.1 | 
| 1115641 | Customizing settings for substance volume tracking | 
| 955194 | Error with classes/characteristics | 
| 905726 | Substance volume tracking in SAP EH&S | 
| 13719 | Preliminary transports to customers (note for customers) |