diff --git a/src/org/kar/archidata/model/GenericTiming.java b/src/org/kar/archidata/model/GenericTiming.java
index 7d8d91c..39dc9b6 100644
--- a/src/org/kar/archidata/model/GenericTiming.java
+++ b/src/org/kar/archidata/model/GenericTiming.java
@@ -7,6 +7,7 @@ import org.kar.archidata.annotation.DataNotRead;
 import org.kar.archidata.annotation.UpdateTimestamp;
 import org.kar.archidata.annotation.apiGenerator.ApiAccessLimitation;
 import org.kar.archidata.annotation.apiGenerator.ApiGenerationMode;
+import org.kar.archidata.annotation.checker.ReadOnlyField;
 
 import com.fasterxml.jackson.annotation.JsonFormat;
 
@@ -22,6 +23,7 @@ public class GenericTiming {
 	@Schema(description = "Create time of the object", example = "2000-01-23T01:23:45.678+01:00")
 	@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSSXXX")
 	@Nullable
+	@ReadOnlyField
 	@ApiAccessLimitation(creatable = false, updatable = false)
 	public Date createdAt = null;
 	@DataNotRead
@@ -30,6 +32,7 @@ public class GenericTiming {
 	@Schema(description = "When update the object", example = "2000-01-23T00:23:45.678Z")
 	@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSSXXX")
 	@Nullable
+	@ReadOnlyField
 	@ApiAccessLimitation(creatable = false, updatable = false)
 	public Date updatedAt = null;
 }
diff --git a/src/org/kar/archidata/model/UUIDGenericData.java b/src/org/kar/archidata/model/UUIDGenericData.java
index c6f2a5d..f6c9c9e 100644
--- a/src/org/kar/archidata/model/UUIDGenericData.java
+++ b/src/org/kar/archidata/model/UUIDGenericData.java
@@ -4,11 +4,11 @@ import java.util.UUID;
 
 import org.kar.archidata.annotation.apiGenerator.ApiAccessLimitation;
 import org.kar.archidata.annotation.apiGenerator.ApiGenerationMode;
+import org.kar.archidata.annotation.checker.ReadOnlyField;
 
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.persistence.Column;
 import jakarta.persistence.Id;
-import jakarta.validation.constraints.NotNull;
 import jakarta.ws.rs.DefaultValue;
 
 @ApiGenerationMode(create = true, update = true)
@@ -17,7 +17,7 @@ public class UUIDGenericData extends GenericTiming {
 	@DefaultValue("(UUID_TO_BIN(UUID(), TRUE))")
 	@Column(nullable = false, unique = true)
 	@Schema(description = "Unique UUID of the object", example = "e6b33c1c-d24d-11ee-b616-02420a030102")
-	@NotNull
+	@ReadOnlyField
 	@ApiAccessLimitation(creatable = false, updatable = false)
 	public UUID uuid = null;
 }
diff --git a/src/org/kar/archidata/model/UUIDGenericDataSoftDelete.java b/src/org/kar/archidata/model/UUIDGenericDataSoftDelete.java
index 2b6a82f..226f2d2 100644
--- a/src/org/kar/archidata/model/UUIDGenericDataSoftDelete.java
+++ b/src/org/kar/archidata/model/UUIDGenericDataSoftDelete.java
@@ -4,6 +4,7 @@ import org.kar.archidata.annotation.DataDeleted;
 import org.kar.archidata.annotation.DataNotRead;
 import org.kar.archidata.annotation.apiGenerator.ApiAccessLimitation;
 import org.kar.archidata.annotation.apiGenerator.ApiGenerationMode;
+import org.kar.archidata.annotation.checker.ReadOnlyField;
 
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.annotation.Nullable;
@@ -18,6 +19,7 @@ public class UUIDGenericDataSoftDelete extends UUIDGenericData {
 	@DataDeleted
 	@Schema(description = "Deleted state", hidden = true)
 	@Nullable
+	@ReadOnlyField
 	@ApiAccessLimitation(creatable = false, updatable = false)
 	public Boolean deleted = null;
 }