Question:
When a user tries to remove a document that is added in a Document Change Control (DCC) object, nothing happened after clicking the Remove icon. What is the root cause and how can this problem be resolved?

Answer:
The document is reclassified to another Document Type that does not have the related Shared Field Release Change Control configured after it is added to the Document Change Control object.
As a workaround, the user can change the Document Type back to the original one. Then, remove the document from the Document Change Control object. Afterwards, the user can change the Document Type back to newest one.
Related Documentation:
Vault Help Documentation: N/A