diff --git a/src/main/java/eu/dnetlib/validatorapi/controllers/ValidationController.java b/src/main/java/eu/dnetlib/validatorapi/controllers/ValidationController.java
index 95a40b2..d440224 100644
--- a/src/main/java/eu/dnetlib/validatorapi/controllers/ValidationController.java
+++ b/src/main/java/eu/dnetlib/validatorapi/controllers/ValidationController.java
@@ -186,11 +186,13 @@ public class ValidationController {
     public void validateWithApacheCamel(@RequestParam(name = "guidelines") String guidelinesProfileName,
                                         @RequestParam(name = "baseUrl", defaultValue = "http://repositorium.sdum.uminho.pt/oai/request") String baseURL, //not in use now
                                         @RequestParam(name="numberOfRecords", defaultValue = "10") int numberOfRecords,
-                                        @RequestParam(name="set", required = false) String set, //not in use  now
-                                        @RequestParam(name="metadataPrefix", defaultValue = "oai_dc") String metadataPrefix) {
+                                        @RequestParam(name="set", required = false) String set//, //not in use  now
+                                        //@RequestParam(name="metadataPrefix", defaultValue = "oai_dc") String metadataPrefix
+                                        ) {
 
         AbstractOpenAireProfile profile =  initializeOpenAireProfile(guidelinesProfileName);
         AbstractOpenAireProfile fairProfile = initializeFairProfile(guidelinesProfileName);
+        String metadataPrefix = initializeMetadataPrefix(guidelinesProfileName);
 
         if (profile == null && fairProfile == null) {
             log.error("Exception: No valid guidelines " + guidelinesProfileName + ".");
@@ -370,6 +372,21 @@ public class ValidationController {
         return null;
     }
 
+    private String initializeMetadataPrefix(String guidelinesProfileName) {
+
+        if (guidelinesProfileName.equals("dataArchiveGuidelinesV2Profile")) {
+            return "oai_openaire";
+
+        } else if (guidelinesProfileName.equals("literatureGuidelinesV3Profile")) {
+            return "oai_dc";
+
+        } else if (guidelinesProfileName.equals("literatureGuidelinesV4Profile")) {
+            return "oai_openaire";
+        }
+
+        return null;
+    }
+
 
     private AbstractOpenAireProfile initializeFairProfile(String guidelinesProfileName) {
         if (guidelinesProfileName.equals("dataArchiveGuidelinesV2Profile")) {