Value mapping for character SPACE

Hi all,

I'm struggeling at the moment with the value mapping for some values. In my case I do a fixed set of values which be mapped with the following value pairs:

X to Y

' ' to N

Especially the second pair seems to be not such easy. After entereing the value mapping group with space doesn't appear in the created value mapping group object.

Any ideas how this can be done using value mapping except using default in Message Mapping?

Thanks,

Axel