Using the tables parameter is obsolete and SAP does not really support this any more. You can add a table type parameter to the changing or exporting section which should work fine but this method is not supported by some older versions of some extraction tools such as XtractIS.
Creating a TABLES parameter
Notice the LIKE option is not available from the drop down any more but you can still use it and ZMY_DATASTRUC must not contain a filed of type string otherwise you will get the FL389 error
