MD-11 FMC error?

Hi Folk'sTried entering a freq on the FMC of 117.90 and got an error message "Entry out of range", tried 117.95, same message. x( Entered a known VOR Ident for 117.90 and that was accepted. Tested lower and upper limits of the nav freq range and only 117.90 and 117.95 were rejected. I assume the FMC software needs a suitable kick in the resistors. :-)Cheers Ron