diff --git a/ontology/yaml/resources/HVAC/entity_types/ABSTRACT.yaml b/ontology/yaml/resources/HVAC/entity_types/ABSTRACT.yaml
index c05b047eb1..68428f72b5 100644
--- a/ontology/yaml/resources/HVAC/entity_types/ABSTRACT.yaml
+++ b/ontology/yaml/resources/HVAC/entity_types/ABSTRACT.yaml
@@ -6789,6 +6789,7 @@ OAQM:
   - MONITORING
 
 UDEC:
+  guid: "956f1afb-04b1-4d4d-afb9-4aff1ac51b20"
   description: "Up and down extension control for shades."
   is_abstract: true
   uses:
diff --git a/ontology/yaml/resources/HVAC/entity_types/SDC.yaml b/ontology/yaml/resources/HVAC/entity_types/SDC.yaml
index f1af804292..c562fae3a3 100644
--- a/ontology/yaml/resources/HVAC/entity_types/SDC.yaml
+++ b/ontology/yaml/resources/HVAC/entity_types/SDC.yaml
@@ -86,6 +86,7 @@ SDC_EXTOR:
   - shade_mode
 
 SDC_UDEC:
+  guid: "34201ca6-677b-47bc-b624-a80581490b6d"
   description: "Simple shade with up and down extent control."
   is_canonical: true
   implements: