KM00F05: ERROR_IllegalTransformToUset

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Message	Invalid transform to="<param>": Set variable (\$[…]) cannot be used in 'to=' unless part of a map.
Module	kmc-ldml.LdmlCompilerMessages
Identifier	ERROR_IllegalTransformToUset

Hint: If a map was meant, must use the form <transform from="($[fromSet])" to="$[1:toSet]"/>.