If PersonA in the team is modifying an object in a document (ie has the Properties window open for that object), and PersonB (unbeknownst to PersonA) is also modifying the same object from the same document, the following happens. PersonA finishes, and exits the object Properties window. Then PersonB also finishes modifying the object and closes the Properties window. PersonA saves their document. Sometime after, PersonB saves their document. After clicking the merge button (that shows up in bottom right corner of RoyalTS, PersonA now takes a look at the object, and anything they did was overwritten by PersonB's modifications. Even if PersonB didn't touch the particular field that PersonA was modifying.