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Yes, hierarchical tree item labels may be longer than 50. In my Oracle Forms 10g environment I have a hierarchical tree with labels of length 255; I suspect the length can go higher.
Find the record group object that populates the hierarchical tree object. This record group object has a column named "label"; increase it from Varchar2(50) to a larger size.
maybe a new high score: diggging up a 13 year old thread.