I want to know the answer to the following question:
What document was signed in 1999?
All the background I'm provided with is that "In 1999, the representatives of Lutheran World Federation and Catholic Church signed the Joint Declaration on the Doctrine of Justification, apparently resolving the conflict over the nature of justification which was at the root of the Protestant Reformation, although Confessional Lutherans reject this statement.". Is that enough to answer the question?
Answer: yes