New answers tagged versioning
I found my answer in the source of Versions.aspx, the system file used for the Version history modal. In this file at line 330, we can see that the number of changed that can be shown in hard coded at 15. Therefore, there is no way to change this OOB. It seems my only option is to develop a custom version history page.
I simply added the field to the ExcludeFields property of the list field iterator. <SharePoint:ListFieldIterator ID="ListFieldIterator1" runat="server" ExcludeFields="AktuelleBewertung" />
Imho there is no non-programmatically method to do it. If You have access to server, You can use powershell like Jasper already answered, example of function is here. But without access on host server you will need to use web-services, and most likely you meet permissions problem again there.
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