diff --git a/services/iaas/oas_commit b/services/iaas/oas_commit
index 2fd4b6b8b..abd8d51b0 100644
--- a/services/iaas/oas_commit
+++ b/services/iaas/oas_commit
@@ -1 +1 @@
-f05986bf33be92fa5cbe425bcf5e4a11dd3c7463
+46f03c1468dd453695c05e72c088a6bfb5a4bbab
diff --git a/services/iaas/v1api/model_area_id.go b/services/iaas/v1api/model_area_id.go
index 4c26ea620..370cb216e 100644
--- a/services/iaas/v1api/model_area_id.go
+++ b/services/iaas/v1api/model_area_id.go
@@ -14,6 +14,7 @@ package v1api
 import (
 	"encoding/json"
 	"fmt"
+	"regexp"
 )
 
 // AreaId - The identifier (ID) of an area.
@@ -57,10 +58,13 @@ func (dst *AreaId) UnmarshalJSON(data []byte) error {
 	err = json.Unmarshal(data, &dst.String)
 	if err == nil {
 		jsonString, _ := json.Marshal(dst.String)
-		if string(jsonString) == "{}" { // empty struct
-			dst.String = nil
-		} else {
+		// OVERRIDE: this pattern match is custom
+		regex := `^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$`
+		isMatched, _ := regexp.MatchString(regex, *dst.String)
+		if string(jsonString) != "{}" && isMatched { // empty struct
 			match++
+		} else {
+			dst.String = nil
 		}
 	} else {
 		dst.String = nil
diff --git a/services/iaas/v2api/model_area_id.go b/services/iaas/v2api/model_area_id.go
index 3c516b052..bd0b814d4 100644
--- a/services/iaas/v2api/model_area_id.go
+++ b/services/iaas/v2api/model_area_id.go
@@ -14,6 +14,7 @@ package v2api
 import (
 	"encoding/json"
 	"fmt"
+	"regexp"
 )
 
 // AreaId - The identifier (ID) of an area.
@@ -57,10 +58,13 @@ func (dst *AreaId) UnmarshalJSON(data []byte) error {
 	err = json.Unmarshal(data, &dst.String)
 	if err == nil {
 		jsonString, _ := json.Marshal(dst.String)
-		if string(jsonString) == "{}" { // empty struct
-			dst.String = nil
-		} else {
+		// OVERRIDE: this pattern match is custom
+		regex := `^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$`
+		isMatched, _ := regexp.MatchString(regex, *dst.String)
+		if string(jsonString) != "{}" && isMatched { // empty struct
 			match++
+		} else {
+			dst.String = nil
 		}
 	} else {
 		dst.String = nil
diff --git a/services/iaas/v2beta1api/model_area_id.go b/services/iaas/v2beta1api/model_area_id.go
index 938c9d001..e6adbeb20 100644
--- a/services/iaas/v2beta1api/model_area_id.go
+++ b/services/iaas/v2beta1api/model_area_id.go
@@ -14,6 +14,7 @@ package v2beta1api
 import (
 	"encoding/json"
 	"fmt"
+	"regexp"
 )
 
 // AreaId - The identifier (ID) of an area.
@@ -44,10 +45,13 @@ func (dst *AreaId) UnmarshalJSON(data []byte) error {
 	err = json.Unmarshal(data, &dst.StaticAreaID)
 	if err == nil {
 		jsonStaticAreaID, _ := json.Marshal(dst.StaticAreaID)
-		if string(jsonStaticAreaID) == "{}" { // empty struct
-			dst.StaticAreaID = nil
-		} else {
+		// OVERRIDE: this pattern match is custom
+		regex := `^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$`
+		isMatched, _ := regexp.MatchString(regex, string(*dst.StaticAreaID))
+		if string(jsonStaticAreaID) != "{}" && isMatched { // empty struct
 			match++
+		} else {
+			dst.StaticAreaID = nil
 		}
 	} else {
 		dst.StaticAreaID = nil