Solution : https://service.sap.com/sap/support/notes/719694 (SAP Service marketplace login required)
Key words :
activate bc sets, error messages mentioned, single-system landscape, multi-system landscape, productive logon client', system transport request, cross-client tables, error message 'activation, customizing transport request, transport requests
Related Notes :
| 855959 | Activation of Extension Sets via SPRO not successful |
| 337623 | Customizing after installation or upgrade |