ORA-09929: GLB of two labels is invalid

ORA-09929
ORA-09929: GLB of two labels is invalid
Cause: The result of a greatest lower bound operation on two labels was not valid.
Action: Repeat the operation with two different labels. Consult the system
encoding file for the values of valid labels.
More details : Viste http://www.high-oracle.com/ora-09929/
More details : Viste http://www.high-oracle.com/ora-09929/
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