The error is a nuanced but critical failure mode in mainframe VSAM processing. It signals a mismatch between program expectation and dataset reality—a program believes a key should exist for an exclusive operation, but VSAM cannot find it.
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To understand this error, you must understand the architecture of the software that usually generates it—most notably , ESET Security Management Center (ESMC) , or ESET PROTECT . The error is a nuanced but critical failure