Causa: In a declaration, the name of a variable or cursor is misspelled or the declaration makes a forward reference. Forward references are not allowed in PL/SQL. A variable or cursor must be declared before it is referenced it in other statements, including other declarative statements. For example, the following declaration of dept_rec raises this exception because it refers to a cursor not yet declared:
Acción: Check the spelling of all identifiers in the declaration. If necessary, move the declaration so that it makes no forward references.
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