I've now checked this function and I have to say that it still doesn't work. If you change the label for a query range, AX 5.0 will give you an error message, too.
This is a follow up to a previous post: http://axaptafreak.blogspot.com/2007/07/label-for-query-range-cannot-be.html
Development tutorial: SysExtension framework in factory methods where the constructor requires one or more arguments
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