In the settings you can set the version you want the jrxml to be compatible with.
However, you cannot select the latest version in a fixed manner. If I do, when updating JSS, the version automatically changes too.
In JSS 5.6.2 the options are:
Last version (5.6.1) <- This one is WRONG, it's not 5.61, it _currently_ 5.6.1 but it's version is NOT GUARANTEED. Unlike the options that follow.
JR 5.5.1 <- these are fixed.
While the options should be:
Last version (5.6.1)
JR 5.6.1 <- add this one.
Maarten @ Yesplan