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VTAM® hint: An error has occurred during COS mapping in a node supporting APPN multiple network connectivity. Whenever a search crosses an APPN subnetwork link, the node receiving the search must map the COS it received to an equivalent COS to be used in its subnet. The COS being mapped is defined by the user in the COSMAP definition deck. The error occurs when the user maps the original COS to a COS that has not been defined within this node.