It is fine you, Koen, that you called our attention to this constraint.
Unfortunately, at present, AMOS does not offer a way to filter limitations on string length, so translators are never aware of any errors they may make.
It would be nice, and perhaps not that difficult, if AMOS included a hint [perhaps in square brackets after the source string in the form of a number] indicating any constraints that are to be followed. No number - no constraint.
Karoly