Message type: E = Error
Message class:  HRPAYFI_KATRE - KATRE (Income Register) 
Message number: 016
Message text: Data collector results contain invalid XML.
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The SAP error message HRPAYFI_KATRE016 indicates that there is an issue with the XML data being processed by the data collector in the HR Payroll FI (Financial Integration) module. This error typically arises when the XML structure is not valid or does not conform to the expected schema. Causes: Malformed XML: The XML data being processed may have syntax errors, such as missing tags, incorrect nesting, or invalid characters. Schema Mismatch: The XML does not conform to the expected schema defined for the data collector, which can happen if there are changes in the data structure or if the wrong version of the XML is being used. Data Issues: Certain data elements within the XML may contain invalid values or formats that are not acceptable. Encoding Issues: The XML file may have encoding problems, such as incorrect character encoding (e.g., UTF-8 vs. ISO-8859-1). Solutions: Validate XML: Use an XML validator tool to check the structure of the
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