SAP string 转 number 类型
try.
cl_fdt_calculation=>convert_string_to_number( exporting iv_text = conv #( lwa_atnam-atwrt )
importing ev_number = data(l_num) ).
<lfs_commission>-ratio = l_num.
catch cx_fdt_conversion.
catch cx_sy_conversion_overflow.
endtry.