diff --git a/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/BaseExecutionRequest.java b/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/BaseExecutionRequest.java
new file mode 100644
index 0000000..3af3ebf
--- /dev/null
+++ b/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/BaseExecutionRequest.java
@@ -0,0 +1,24 @@
+package org.gcube.application.cms.plugins.requests;
+
+import lombok.Data;
+import org.bson.Document;
+import org.gcube.application.geoportal.common.faults.InvalidRequestException;
+import org.gcube.application.geoportal.common.model.document.ProfiledDocument;
+import org.gcube.application.geoportal.common.model.profile.Profile;
+
+@Data
+public class BaseExecutionRequest {
+
+    Profile profile;
+    ProfiledDocument document;
+    Document callParameters;
+
+    public final String getMandatory(String param) throws InvalidRequestException {
+        return getMandatory(param,callParameters);
+    }
+
+    public static final String getMandatory(String param,Document params) throws InvalidRequestException {
+        if(!params.containsKey(param)) throw new InvalidRequestException("Missing mandatory parameter "+param);
+        return params.getString(param);
+    }
+}
diff --git a/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/EventExecutionRequest.java b/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/EventExecutionRequest.java
index a10efbf..0537d31 100644
--- a/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/EventExecutionRequest.java
+++ b/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/EventExecutionRequest.java
@@ -7,7 +7,7 @@ import org.gcube.application.geoportal.common.model.document.ProfiledDocument;
 import org.gcube.application.geoportal.common.model.profile.Profile;
 
 @Data
-public class EventExecutionRequest {
+public class EventExecutionRequest extends BaseExecutionRequest{
 
     public static class Events{
         public static final String ON_INIT_DOCUMENT="@@@INIT_DOCUMENT@@";
@@ -15,9 +15,8 @@ public class EventExecutionRequest {
         public static final String ON_DELETE_DOCUMENT="@@@DELETE_DOCUMENT@@";
     }
 
-    Profile profile;
-    ProfiledDocument document;
+
     String event;
-    Document callParameters;
+
 
 }
diff --git a/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/MaterializationRequest.java b/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/MaterializationRequest.java
index 3d24730..60f8eab 100644
--- a/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/MaterializationRequest.java
+++ b/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/MaterializationRequest.java
@@ -6,9 +6,7 @@ import org.gcube.application.geoportal.common.model.document.ProfiledDocument;
 import org.gcube.application.geoportal.common.model.profile.Profile;
 
 @Data
-public class MaterializationRequest {
+public class MaterializationRequest extends BaseExecutionRequest{
+
 
-    ProfiledDocument document;
-    Document parameters;
-    Profile profile;
 }
diff --git a/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/StepExecutionRequest.java b/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/StepExecutionRequest.java
index c230f19..de56486 100644
--- a/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/StepExecutionRequest.java
+++ b/cms-plugin-framework/src/main/java/org/gcube/application/cms/plugins/requests/StepExecutionRequest.java
@@ -8,7 +8,7 @@ import org.gcube.application.geoportal.common.model.document.accounting.User;
 import org.gcube.application.geoportal.common.model.profile.Profile;
 
 @Data
-public class StepExecutionRequest {
+public class StepExecutionRequest extends BaseExecutionRequest{
 
     public static class Steps{
 
@@ -20,10 +20,8 @@ public class StepExecutionRequest {
     }
 
 
-    Profile profile;
-    ProfiledDocument document;
+
     String step;
-    Document callParameters;
     User user;
     Context context;
 }