Solution : https://service.sap.com/sap/support/notes/1644833 (SAP Service marketplace login required)
Summary : 
      This SAP Note outlines the essential details required for retaining SAP Best Practice add-ons during upgrades to later versions of SAP Netweaver, ERP, SCM, and CRM. The note is relevant for customers in the BS7i2011 ramp-up phase or for SAP’s internal system upgrades. It specifies the use of a "Vendor Key" during the IS_SELECT phase of the upgrade process, facilitated by tools such as SAPEhpi, SUM, or SAPup, to ensure the retention of the Best Practice add-ons. It includes specific vendor keys for different SAP_BASIS releases. If issues occur, users are advised to contact SAP support under component BC-UPG-ADDON with appropriate details specified.
Key words : 
bp-instass 2056515 2031478 2530464 2587354bp-solbld 1114090 1652878 1928759 2028104bp-erp05 1831003 2899480 1608445 2368919bp-erp 1009599 1317866 1101854 1619034bp-scm 832742 610980 1209078 803897bp-crm 1235964 1007618 1827574 1569950bp-crm60 2318221 1879400 2619183 2239519bp-crm70 1981731 1952987 2316940 2176935bp-canw 1278379, higher release ofsap netweaver/ erp/ scm/ crm, sap netweaver/ erp/ scm/ crmreleases, installed sap bp add-ons based, higher sap application release requires, sap bp add-ons based, sap ehpi/sapup/sum asks, sap bp package based, sap bp add-ons, sap bp package activation
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| 1240936 | SAP Best Practices DVD Material Number |