diff --git a/src/main/webapp/assets/schema/hl7Application.schema.json b/src/main/webapp/assets/schema/hl7Application.schema.json
index cf6da103..45884649 100644
--- a/src/main/webapp/assets/schema/hl7Application.schema.json
+++ b/src/main/webapp/assets/schema/hl7Application.schema.json
@@ -76,7 +76,18 @@
       "description": "MSH fields to be validated if missing or not, according to <a href=\"https://www.ihe.net/uploadedFiles/Documents/Radiology/IHE_RAD_TF_Vol2.pdf#page=43\" target=\"_blank\">IHE RAD TF Vol 2 Message Control requirements</a>. If absent, <a href=\"https://dcm4chee-arc-hl7cs.readthedocs.io/en/latest/hl7-impl-notes.html#error-codes-mapping\" target=\"_blank\">previous default checks in dcm4che library</a> are applied.",
       "type": "array",
       "items": {
-        "type": "integer"
+        "type": "integer",
+        "enum": [
+          3,
+          4,
+          5,
+          6,
+          7,
+          9,
+          10,
+          11,
+          12
+        ]
       }
     },
     "dicomDescription": {