PLS-00221：'string' is not a procedure or is undefined
错误码
错误描述：'string' is not a procedure or is undefined
错误原因：An identifier being referenced as a procedure was not declared or actually represents another object (for example, it might have been declared as a function).
解决方法：Check the spelling and declaration of the identifier. Also confirm that the declaration is placed correctly in the block structure.
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