Solution : https://service.sap.com/sap/support/notes/585334 (SAP Service marketplace login required)
Key words :
call function 'ztest_func' destination dest exporting param_in = local_import tables param_tab = local_table, call function 'ztest_func' destination dest exporting param_in = local_import, processing changing/tables parameters, '> <param_in>10</param_in> <param_tab/> </rfc, imaginary function module ztest_func, valid soap requests/responses, '> <param_in>10</param_in> </rfc, function call, import parameter param_in, function module ztest_func