UPDATE: This is now resolved, see answer below.
I am having a bit of trouble trying to work out the correct way to write an NHibernate Mappi
RESOLVED: I have now resolved this issue. First of all there was the issue of the ID property being set to "name=Id" instead of "name=Month". Secondly, I had to wrap the exec command in a CDATA and also put a comma seperator between the parameters. The full working mapping file is below for future reference to anyone experiencing a similar problem.
Cheers!