https://userapps.support.sap.com/sap/support/knowledge/en/2033795
2033795 - 644 error reported on a system table - SAP ASE | SAP Knowledge Base Article
ASE sever reports Error#644 in its error log file like below: Error: 644 , Severity: 21, State: 5 Index row entry for data row id (586, 9) is missing from...