diff --git a/OpenAPI/TS28312_IntentNrm.yaml b/OpenAPI/TS28312_IntentNrm.yaml
index 3d018cb18699e9e39f4220c58e9f6ac3c4e9f368..81fc68b3a1163068846f03b0cce7db632cea2221 100644
--- a/OpenAPI/TS28312_IntentNrm.yaml
+++ b/OpenAPI/TS28312_IntentNrm.yaml
@@ -411,8 +411,12 @@ components:
               - FEASIBLE
               - INFEASIBLE
         infeasibilityReason:
+          description: An attribute which is used when feasibilityCheckResult is INFEASIBLE 
           type: string
-          description: An attribute which is used when feasibilityCheckResult is INFEASIBLE          
+          readOnly: true      
+          enum:
+             - INVALID_INTENT_EXPRESSION
+             - INTENT_CONFLICT
    #-------Definition of the concrete IntentFeasibilityCheckReport dataType----------------#
 
    #-------Definition of the generic IntentHandlingCapability dataType----------------#