diff --git a/TOOLS/config/test/profile.env b/TOOLS/config/test/profile.env
index 008f4c6..e5820ed 100644
--- a/TOOLS/config/test/profile.env
+++ b/TOOLS/config/test/profile.env
@@ -3,7 +3,7 @@ NUBES_API_ENDPOINT="https://lk-api-gateway-test.ngcloud.ru/api/v1/svc"
 TOKEN_FILE="secrets/test.token"
 
 # Version
-VERSION="5.1.2"
+VERSION="5.1.3"
 
 # Docs generation — ONLY from docs_gen/<stand>/ (never from docs/)
 DOCS_GEN_DIR="provider/docs_gen/test"
diff --git a/provider/internal/core/client.go b/provider/internal/core/client.go
index 9cab347..7434f1a 100644
--- a/provider/internal/core/client.go
+++ b/provider/internal/core/client.go
@@ -1158,16 +1158,7 @@ func (c *UniversalClient) resolveRefSvcParamValues(ctx context.Context, opParams
 	for paramId, value := range params {
 		newValue := value
 		if refSvcId, ok := refById[paramId]; ok {
-			if refSvcId == 12 {
-				if !isUUIDLike(value) {
-					return nil, fmt.Errorf("параметр %d должен быть UUID (S3 Object Storage, serviceId=12): %s", paramId, value)
-				}
-				// FIX(uuid-case): нормализуем UUID к lowercase для отправки в API.
-				// Пользователь мог написать "6214BA32-...", API принимает оба варианта,
-				// но сам всегда возвращает нижний регистр. Регистр пользователя будет
-				// восстановлен в state после RefreshResourceState (generated resource).
-				newValue = strings.ToLower(value)
-			} else if strings.TrimSpace(value) == "" {
+			if strings.TrimSpace(value) == "" {
 				// Опциональный ref-параметр не задан — оставляем пустым
 				newValue = ""
 			} else if !isUUIDLike(value) {
diff --git a/provider/internal/resources_core/resource_diagnostics_required.go b/provider/internal/resources_core/resource_diagnostics_required.go
index 56ef656..d88e0a1 100644
--- a/provider/internal/resources_core/resource_diagnostics_required.go
+++ b/provider/internal/resources_core/resource_diagnostics_required.go
@@ -453,9 +453,6 @@ func isValidRefValue(options []core.RefServiceInstanceOption, refSvcId int, valu
 		if strings.EqualFold(strings.TrimSpace(opt.InstanceUID), value) {
 			return true
 		}
-		if refSvcId == 12 {
-			continue
-		}
 		if strings.EqualFold(strings.TrimSpace(opt.DisplayName), value) {
 			return true
 		}
@@ -465,21 +462,12 @@ func isValidRefValue(options []core.RefServiceInstanceOption, refSvcId int, valu
 
 func formatRefOptions(options []core.RefServiceInstanceOption, refSvcId int, limit int) string {
 	if len(options) == 0 {
-		if refSvcId == 12 {
-			return "требуется UUID существующего инстанса"
-		}
 		return "список пуст"
 	}
 	formatted := make([]string, 0, len(options))
 	for _, opt := range options {
 		uid := strings.TrimSpace(opt.InstanceUID)
 		name := strings.TrimSpace(opt.DisplayName)
-		if refSvcId == 12 {
-			if uid != "" {
-				formatted = append(formatted, uid)
-			}
-			continue
-		}
 		if name != "" && uid != "" {
 			formatted = append(formatted, name+" ("+uid+")")
 		} else if uid != "" {