Solution : https://service.sap.com/sap/support/notes/47482 (SAP Service marketplace login required)
Key words : 
transaction se12 -> structure accit -> append structures -> zaaccit -> include fields, transaction se12 -> structure zaaccit -> activate2, customer-defined account assignment fields, customer-defined additional account assignments, previously glx = extended general ledger, additional account assignments defined, fi-sl field movementsactivation, fi-sl field movementsprocedure, transport system isset correctly, fi-sl field movements
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