Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding General Terrain locked by source control

I have the same issue. "Locked by Source Control" whatever that is. How do I "unlock" it? I need to modify this terrain to finish my level. Ever since I have started to use this editor I have been plagued by bug after bug after bug, it's frustrating.