ORA-18100: XUST0001 - Updating expression in a wrong position

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ORA-18100: XUST0001 -Updating expression in a wrong position
Cause: An updating expression was used in a position otherthan one of the
following:
- The topmost expression in the body of a query.
- The MODIFY clause of a TRANSFORM expression.
- The RETURN clause of a FLWOR expression.
- The RETURN clauses of a TYPESWITCH expression in which every RETURN
clause contains an updating expression, an empty expression ( ), or a call tothe
fn:error function.
- The THEN and ELSE clauses of a conditional statement in which both the then
and else clauses contain either an updating expression, an empty expression (), or
a call to the fn:error function.
- An operand of a comma expression in which each operand is either an updating
expression, an empty expression ( ), or a call to the fn:error function.
- The content of a parenthesized expression.
- The body of a function declaration in which the keyword UPDATING is
specified.
13-246 Oracle Database ErrorMessages
Action: None