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PLS-01909: : cannot assign supertype instance to subtype



PLS-01909: : cannot assign supertype instance to subtype..

Answer / guest

Cause: An attempt was made to assign or copy a supertype
instance to a container (destination) that can only hold a
subtype instance.

Action: Make sure the runtime type of the source of the
assignment or copy is the same type as the destination or is
a subtype of the destination type

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