Never a truer word is spoken in jest Icarus.....
GPS (allowing true RNAV capability) was not a standard fit in A320's till around MSN 1000 or so. The XR aircraft is in the 400's from what I read earlier in this thread. So unless previous owners retro fitted this aircraft (which is highly unlikely given the huge investment for an old aircraft) it will be IRS driven FMC's only, so RNAV approaches will be out.
Mind you, I hear CASA are close to revoking the RNAV approach capability for all 3rd party installed GPS systems that are not multi mode integrated units anyway, so the F100 will be in the same boat soon also. Cloudbreak better buy an NDB methinks.