Solution : https://service.sap.com/sap/support/notes/889401 (SAP Service marketplace login required)
Key words : 
terms ipc dataloader update buffer reason, automatic buffer update, ipc buffers, local database, loading data, updated immediatly, initial download, dataloadermgr, prerequisites, note 486061
Related Notes : 
       
| 1047771 | pricing is uploaded in local DB, but not immediately active | 
| 486061 | How to get patches for CRM Internet Pricing Configurator |