Solution : https://service.sap.com/sap/support/notes/611976 (SAP Service marketplace login required)
Key words : 
remote command changedocument, return pricing conditions, support package levels 11 - 15, pricing procedure subsequently, support package 16, pricing procedure, terms pricingdocument, price item, existing items, finally set
Related Notes : 
       
| 593892 | Setting the pricing procedure subsequently | 
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| 486061 | How to get patches for CRM Internet Pricing Configurator |