Hello everyone, 

I have spent quite some time on trying to figure this out on my own yet I could not reach a solution. 

I have received a TBX file from a client out of which I have created a multiterm Termbase. The provided TBX contains allowed and forbidden terms. I have set these up as a pick list in order to use the verification check in studio for a translated file. 

If I run the verification check as normal I run into no issues. By as normal I mean with the following settings in studio:

As soon as I change the setting to include the distinction between allowed and prohibited i cannot run the verification check anymore.

Like so : 

This is the error i receive in studio when verifying my file with the above setting (stack trace included in case needed) : 

I have found this article about the issues : https://gateway.sdl.com/articles/SolutionArticles/000001900?articleName=Error-when-verifying-document-or-confirming-segment-Sequence-contains-no-matching-element but it does not really give me a path to solving it as I cannot find duplicate terms and I am making sure I do not ignore sublanguages when creating the termbase. 

Any help with this would be greatly appreciated. I have tried this in both Studio 2019 and Studio 2015 

I would be able to provide the files in question but on a public forum. 

Regards,
Cristian