public void syncTimes() {
		if (sourceDt == null) {
			throw new IllegalStateException("Can't sync datatypes with missing source datatype.");
		}
		long lastChangeTime = sourceDt.getLastChangeTime();
		refDt.setLastChangeTimeInSourceArchive(lastChangeTime);
		refDt.setLastChangeTime(lastChangeTime);
	}
Disassociates this DataTypeSyncInfo's data type from its source archive.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/DataTypeSyncInfo.java