Solution : https://service.sap.com/sap/support/notes/602101 (SAP Service marketplace login required)
Key words : 
worksheets 'add' = worksheet         exporting            #1 = '%_empty_parameter'            #2 = '%_empty_parameter'            #3 = 1, excel 'workbooks' = workbooks  call method, acall method parameter list, create object excel 'excel, workbooks 'add' = workbook, workbook 'worksheets' = worksheets, free object worksheet, worksheet   type ole2_object, free object workbooks, workbooks   type ole2_object
Related Notes : 
       
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| 96885 | Downloading front end patches |