Solution : https://service.sap.com/sap/support/notes/913237 (SAP Service marketplace login required)
Key words :
' type 'subtotal5+6' enter user exit class, userexit description 'sutotal 5 + subtotal 6' 5, details - enter formula number 81, enter user exit, userexit type 'val', field 'user exit, sap service marketplace, latest ipc patch, formula 81 adds subtotal 5, terms pricing engine
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