I am running 8.1.23 and this problem still exists. When will this ever get fixed?
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Still seeing this in 8.1.25, but I'm not the team member responsible for fixing. I believe we've found that connecting OPC resolves at least some of these issues (anecdotally)
I get the same progblem in 8.1.26, but I found a solution.
The problem came after I exported my udts and instances and imported them on a new server. The error message appears in the tag editor as "Structure contains invalid parent data types". As you see in the picture, the tags in the structure are marked with orange dotted underscores.
The way I fixed it was to Change the content in the field "OPC Item Path", Press apply, Changing back to my correct OPC item path, and pressing apply again.
The error message and the way I fixed the problem doesnt seem to correspond, so this was strange.