compatible with CPIC level0_id

csst_common/file.py

@@ -122,4 +122,8 @@ class File:
 
     @property
     def level0_id(self):
-        return self.obs_id + self.detector
+        if self.instrument == "MSC":
+            return self.obs_id + self.detector
+        if self.instrument == "CPIC":
+            return self.obs_id + self.project
+        raise ValueError(f"Unmatched instrument: {self.instrument}")