TTDTG Languages: Change from control program

Hi Guys,

I've created a SAPScript using System Symbols and I've defined them in TTDTG table in different languages.

The question is how to recover the System Symbols in a different language than loggin language. I mean, I log on SAP in English for example, but in some cases I would like to change the output from System Symbols into another language, controlling it from program who calls the SAPScript.

I've tried to change the NAST and SY-LANGU language, but it didn't run.

Thanks in advance.

Regards

Arnau