Hello bg2492,

I'm trying to migrate a WinCC project from WinCC v6.0 to WinCC v8.1.

The migrated project to WinCC v7.2 works without errors. The cross-referecing is the same and correct.

When I open a migrated project  from WinCC v7.2 in WinCC v7.5 or WinCC v8.1, the cross-referencing throws an SQL exception.

System.Exception: System.Data.SqlClient.SQLException (0x80131904): Invalid column name ‘HidingVarID’….

I tried using your query (but 0 rows affected). 

I tried deleting content from tables as you  suggested (the same i found on support siemens)

https://support.industry.siemens.com/cs/document/109779128/how-do-you-open-the-wincc-cross-reference-editor-if-opening-of-the-editor-is-aborted-by-a-system-exception-error-?dti=0&lc=en-SK

Still without success. 

Can you give me some advice?

Thanks

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Split from Cross reference sql issue.