Oracle : Ошибка ORA-30553

"The function is not deterministic"
*Cause: The function on which the index is defined is not deterministic
*Action: If the function is deterministic, mark it DETERMINISTIC. If it
is not deterministic (it depends on package state, database state,
current time, or anything other than the function inputs) then
do not create the index. The values returned by a deterministic
function should not change even when the function is rewritten or

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