diff --git a/CHANGES_NEXT_RELEASE b/CHANGES_NEXT_RELEASE
index a1191de3..2fe7453c 100644
--- a/CHANGES_NEXT_RELEASE
+++ b/CHANGES_NEXT_RELEASE
@@ -1 +1,2 @@
+- Fix: do not try cast entity id and entity type in update rules when expand parameters of rule to avoid BadRequest en CB tries to update that entities (#791)
 - Fix: do not invoke calback twice when error about trust not found in trustConf (#790)
diff --git a/lib/models/updateAction.js b/lib/models/updateAction.js
index a40e23d0..1c916c25 100644
--- a/lib/models/updateAction.js
+++ b/lib/models/updateAction.js
@@ -169,8 +169,9 @@ function processOptionParams(action, event) {
             changes[key].metadata = theMeta;
         }
     });
-    changes.id = myutils.expandVar(action.parameters.id, event, true);
-    changes.type = myutils.expandVar(action.parameters.type, event, true);
+    // Do not expandVar with trycast, since entity id and type should be always string values types
+    changes.id = myutils.expandVar(action.parameters.id, event, false);
+    changes.type = myutils.expandVar(action.parameters.type, event, false);
     logger.debug('processOptionParams changes: %j', changes);
     return changes;
 }