Solution : https://service.sap.com/sap/support/notes/1509764 (SAP Service marketplace login required)
Key words : 
data element comt_pcat_ims_activation_timeis assigned, changepointer update process fails, related product catalog objects, attached correction instruction manually, sap support package, master da reason, select data type, tab data type, transparant table comm_pcat_ims_cp, database table comm_pcat_ims_cp
Related Notes : 
       
| 1510562 | 999999 is maximum number of changepointers per day | 
| 1494014 | Runtime exception in web catalog after delta indexing | 
| 1470908 | Changepointer not created after product download to CRM | 
| 1388281 | Time-out occurs during the update of table COMM_PCAT_IMS_CP |