Solution : https://service.sap.com/sap/support/notes/544688 (SAP Service marketplace login required)
Key words :
selected sales area data, 0 support package 12 / crm 3, 1 support package 02 / crm 4, selected business partner, function module crm_cckpt_partner_get, terms fact sheet, sales area' infoblock, sales area, sales area', function module