In the UBL 2.5 Library Elements Spreadsheet - CSD01 master, about row 2831, the cardinality and the definition of OpenTenderEvent are wrong.

Current cardinality: 0..n 

This should be: 0..1

Current description: Textual description of the legal form required for potential tenderers.

This should be something like: The location and time of the public opening of tenders. OR Information on the location and time of the public opening of tenders for this tendering process.