Message type: E = Error
Message class:  SDOKQUEIDX - Message Class for Queueing and Indexing (new) 
Message number: 011
Message text: Document class & does not exist; check the spelling
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The SAP error message SDOKQUEIDX011 indicates that the system is unable to find a document class specified in the system. This typically occurs in the context of document management or when working with SAP's Document Management System (DMS). The error message suggests that the document class you are trying to use does not exist or is incorrectly spelled.
Cause: Incorrect Document Class Name: The document class name may have been misspelled or incorrectly entered. Document Class Not Defined: The document class may not have been created or defined in the system. Authorization Issues: The user may not have the necessary authorizations to access the document class.
Configuration Issues: There may be issues with the configuration of the Document Management System.
Solution: Check Spelling: Verify the spelling of the document class name in the transaction or program where the error occurred. Verify Document Class Existence: Go to the transaction code OAC0 (for Document Class Management) to check if the document
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