Cause: There is no declaration for the
given identifier within the scope of reference. The identifier might be
misspelled, its declaration might be faulty, or the declaration might be
placed incorrectly in the block structure.
Action: Check the spelling and
declaration of the identifier. Also confirm that the declaration is placed
correctly in the block structure.

Relared Errors:
PLS-00314:
TABLE declarations are not allowed as PL/SQL local variables
PLS-00315:
Implementation restriction: unsupported table index type
PLS-00316:
PL/SQL TABLEs must use a single index
PLS-00317:
incomplete type string was not completed in its declarative
region
PLS-00318: type
string is malformed because it is a non-REF mutually recursive
type
PLS-00319:
subquery in an IN or NOT IN clause must contain exactly one
column
PLS-00320: the
declaration of the type of this expression is incomplete or
malformed
PLS-00321:
expression `string` is inappropriate as the left hand side of an
assignmen
PLS-00322:
declaration of a constant `string` must contain an initialization
assignme
PLS-00323:
subprogram or cursor `string` is declared in a package specification
and m