diff --git a/specification/components/schemas/cloudevents/baseMnsCloudEventSignal.yaml b/specification/components/schemas/cloudevents/baseMnsCloudEventSignal.yaml
index cb70d1e..8765d63 100644
--- a/specification/components/schemas/cloudevents/baseMnsCloudEventSignal.yaml
+++ b/specification/components/schemas/cloudevents/baseMnsCloudEventSignal.yaml
@@ -46,7 +46,6 @@ required:
 - specversion
 - type
 - time
-- dataref
 example:
   specversion: '1.0'
   id: 236a1d4a-5d69-4fa9-9c7f-e72bf505aa5b
diff --git a/specification/components/schemas/cloudevents/gpregChangeGpRequestSignal.yaml b/specification/components/schemas/cloudevents/gpregChangeGpRequestSignal.yaml
index abae57f..96440c5 100644
--- a/specification/components/schemas/cloudevents/gpregChangeGpRequestSignal.yaml
+++ b/specification/components/schemas/cloudevents/gpregChangeGpRequestSignal.yaml
@@ -43,7 +43,6 @@ required:
 - specversion
 - type
 - time
-- dataref
 - subject
 definitions:
   iddef:
diff --git a/specification/components/schemas/cloudevents/patientflagsChangeSignal.yaml b/specification/components/schemas/cloudevents/patientflagsChangeSignal.yaml
index 654f18a..1c73585 100644
--- a/specification/components/schemas/cloudevents/patientflagsChangeSignal.yaml
+++ b/specification/components/schemas/cloudevents/patientflagsChangeSignal.yaml
@@ -43,7 +43,6 @@ required:
 - specversion
 - type
 - time
-- dataref
 - subject
 definitions:
   iddef: