dump error function module " " not found

Hi everyone. I'm having this weird problem with a smartform. Even though it works fine in my development environment, I can't manage to solve it in qas.

Thing is that I constantly receive a dump informing that the function module "" does not exist.

Debugging a little I found that the SSF_FUNCTION_MODULE_NAME function is not storing the module name in the variable I set as parameter (lf_fm_name type rs38l_fnam).

I've already checked that the formname is correct. Also sought for the function module of the smartform using the se37 and found it, and tried transporting the whole smartform again just in case, but the error persists.

¿Could anyone give me an idea of what else can I check?

Thanks a lot,

Fernando.