How to replace decimal comma to dot to attribute value?

This is probably very trivial topic but I cannot get the correct result from this:

@ReplaceString(@Value(ATTRIBUTE),,,.)

So idea would be to change e.g input value 1,6 to 1.6.

Or should I change some FME attribute value to have decimal separator as . instead of , ?

EDIT:

I get it working by this workaround. Maybe there's is some fancier solution