As you know, each SAP output device can only have one sort of character set. Generally, each language printout corresponds to each language smartform/sapscript version. But if you have a requirement that you have to be able to print out English with Japanese/Chinses/Thai together, what should we do?
The answer is using Cascading Fonts and relevant device type.
So far only Unicode system supports this tech and there are some preconditions:
You can find that in Note 906031 - Information about cascading fonts device types
And for Cascading fonts setting, please refer to:
Note 812821 - Cascading Font settings and configuration guide at http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/c0169b51-95d5-2b10-469e-f488b2ab5b58