Unicode Flag in JCO RFC Provider

Hi!!

I'm facing the next problem:

We're defining connection of non unicode Business system. And according to XI Configuration guide you need to define a NONUNICODE registered server program in the JCO RFC Provider. eg LCRSAPRFC_NONUNICODE and switch the flag for Unicode to off.

In the next help page i do see the flag that should be switched off:

http://help.sap.com/saphelp_nw04s/helpdata/en/78/20244134a56532e10000000a1550b0/frameset.htm

However in our system the checkbox to switch unicode on or off is not available/not visible.

Anybody seen this problem before?

Thanks in advance!!

Emile