We have discovered that we cannot change itemtypes on our pages in Dynamicweb version 9.3.5 and 9.3.8. Does anybody know of a workaround or a version where the bug doesn't exist? Creating new pages instead is not an option for us since we have a lot of subpages which would then need to be moved manually.
I have tested this on a completely standard Dynamicweb website installation without any custom code. Our tests have shown that the item ID the exception complains about is actually present in the ItemType table. See screenshot if you wish to replicate the issue.
