I need to adjust the Vocabulary Source knowledge_en, however, the fields entered during the Vocabulary Source creation cannot be modified afterward. Therefore, I tried to delete this deprecated Vocabulary Source to create a new one, but it says it's still being referenced in some NLU Models. I checked these models' utterances, and I deleted all utterances connected to this vocabulary source. I also checked directly in the table sys_nlu_utterance; no results. Despite the apparent nonexistence of a relation between this Vocabulary Source and these NLU Models, it keeps saying it has one and blocks me from deleting this Vocabulary Source.
How can I delete this Vocabulary Source and its references to other NLU Models?
