The attachement form in the mail is in Frensh instead of spanish

Hello all,

The attachement smartform is in frensh instead of spanish.

I use the MF CONVERT_OTF and SO_DOCUMENT_SEND_API1.

I check in debeug the nast-spras = 'S' , so it's spanish but in SOST when i open the form in PDF format i find that it is displaying in frensh.

Any suggestions please for this issue ?

Thanks in advance
Rachid