Oracle FND key tables , FND_FLEX_VALUE_HIERARCHIES (4)

FND_FLEX_VALUE_HIERARCHIES stores information about child
value ranges for key flexfield segment values. Each row includes an
identification of the parent value the range belongs to, as well as the low
and high values that make up the range of child values.
FLEX_VALUE_SET_ID identifies the value set to which the parent value
belongs. You need one row for each range of child values (you can have
more than one row for each parent value). Oracle Application Object
Library provides this information for applications reporting purposes.