Oracle Message ORA-19147 - XQST0089: It is a static error if a variable bound in a for clause of a FLWOR expression, and its associated positional variable, do not have distinct names (expanded QNames)

ERRORXQST0089: It is a static error if a variable bound in a for clause of a FLWOR expression, and its associated positional variable, do not have distinct names (expanded QNames)
CAUSEAn error occurred during the processing of the XQuery expression.
ACTIONCheck the detailed error message for the possible causes.