Portal seems to cache RFC results

Hi,

we are calling an RFC in an R/3 4.6C server from an

EP6 SP9 (sneak preview) using JCA. The call is succesful,

but the portal seems to cache the call results; i.e. if

we change the data returned by the RFC the portal receives

the old values. If we restart the portal the returned data

changes, but only on the first call.

I suppose there is some setting for caching RFC results,

but I am not able to find it.

Thanks in advance.

Mattia