diff --git a/descriptors/ModuleDescriptor-template.json b/descriptors/ModuleDescriptor-template.json
index 85b318112..230491cc0 100644
--- a/descriptors/ModuleDescriptor-template.json
+++ b/descriptors/ModuleDescriptor-template.json
@@ -137,7 +137,7 @@
     },
     {
       "id": "request-storage",
-      "version": "6.0",
+      "version": "6.1",
       "handlers": [
         {
           "methods": ["GET"],
diff --git a/ramls/request.json b/ramls/request.json
index aa582e033..f2fbfd1a4 100644
--- a/ramls/request.json
+++ b/ramls/request.json
@@ -18,6 +18,11 @@
       "type": "string",
       "enum": ["Hold", "Recall", "Page"]
     },
+    "ecsRequestPhase": {
+      "description": "Stage in ECS request process, absence of this field means this is a single-tenant request",
+      "type": "string",
+      "enum": ["Primary", "Secondary"]
+    },
     "requestDate": {
       "description": "Date the request was made",
       "type": "string",
diff --git a/src/test/java/org/folio/rest/api/RequestsApiTest.java b/src/test/java/org/folio/rest/api/RequestsApiTest.java
index 14521c857..cf2435013 100644
--- a/src/test/java/org/folio/rest/api/RequestsApiTest.java
+++ b/src/test/java/org/folio/rest/api/RequestsApiTest.java
@@ -1958,6 +1958,46 @@ public void cannotCreateRequestWithoutStatus()
     )));
   }
 
+  @Test
+  public void canCreateRequestWithEcsRequestPhase() throws MalformedURLException,
+    ExecutionException, InterruptedException, TimeoutException {
+
+    JsonObject representation = createEntity(
+      new RequestRequestBuilder()
+        .page()
+        .primary()
+        .withId(UUID.randomUUID())
+        .create(),
+      requestStorageUrl()).getJson();
+    assertThat(representation.getString("ecsRequestPhase"), is("Primary"));
+
+    representation = createEntity(
+      new RequestRequestBuilder()
+        .page()
+        .secondary()
+        .withId(UUID.randomUUID())
+        .create(),
+      requestStorageUrl()).getJson();
+    assertThat(representation.getString("ecsRequestPhase"), is("Secondary"));
+  }
+
+  @Test
+  public void shouldReturn400IfInvalidEcsRequestPhase() throws MalformedURLException,
+    ExecutionException, InterruptedException, TimeoutException {
+
+    var request = new RequestRequestBuilder()
+        .page()
+        .withEcsRequestPhase("Invalid")
+        .withId(UUID.randomUUID())
+        .create();
+
+    CompletableFuture<JsonResponse> createCompleted = new CompletableFuture<>();
+    client.post(requestStorageUrl(), request, TENANT_ID, ResponseHandler.json(createCompleted));
+
+    assertThat(createCompleted.get(5, TimeUnit.SECONDS).getStatusCode(), is(400));
+  }
+
+
   private RequestDto.RequestDtoBuilder holdShelfOpenRequest() {
     return RequestDto.builder()
       .requesterId(UUID.randomUUID().toString())
diff --git a/src/test/java/org/folio/rest/support/builders/RequestRequestBuilder.java b/src/test/java/org/folio/rest/support/builders/RequestRequestBuilder.java
index ccb8f60c6..d849b35e3 100644
--- a/src/test/java/org/folio/rest/support/builders/RequestRequestBuilder.java
+++ b/src/test/java/org/folio/rest/support/builders/RequestRequestBuilder.java
@@ -52,6 +52,7 @@ public class RequestRequestBuilder extends JsonBuilder {
   private final String patronComments;
   private final UUID holdingsRecordId;
   private final SearchIndex searchIndex;
+  private final String ecsRequestPhase;
 
   public RequestRequestBuilder() {
     this(UUID.randomUUID(),
@@ -79,6 +80,7 @@ public RequestRequestBuilder() {
       null,
       null,
       UUID.randomUUID(),
+      null,
       null);
   }
 
@@ -101,6 +103,7 @@ public JsonObject create() {
     put(request, "requestExpirationDate", this.requestExpirationDate);
     put(request, "holdShelfExpirationDate", this.holdShelfExpirationDate);
     put(request, "pickupServicePointId", this.pickupServicePointId);
+    put(request, "ecsRequestPhase", this.ecsRequestPhase);
 
     if (this.itemSummary != null) {
       final JsonObject item = new JsonObject();
@@ -204,7 +207,8 @@ public RequestRequestBuilder withNoId() {
       this.tags,
       this.patronComments,
       this.holdingsRecordId,
-      this.searchIndex);
+      this.searchIndex,
+      this.ecsRequestPhase);
   }
 
   public RequestRequestBuilder toHoldShelf() {
@@ -247,7 +251,8 @@ public RequestRequestBuilder withItem(RequestItemSummary item) {
       this.tags,
       this.patronComments,
       this.holdingsRecordId,
-      this.searchIndex);
+      this.searchIndex,
+      this.ecsRequestPhase);
   }
 
   public RequestRequestBuilder withRequester(
@@ -282,7 +287,8 @@ public RequestRequestBuilder withRequester(
       this.tags,
       this.patronComments,
       this.holdingsRecordId,
-      this.searchIndex);
+      this.searchIndex,
+      this.ecsRequestPhase);
   }
 
   public RequestRequestBuilder withRequester(
@@ -316,7 +322,8 @@ public RequestRequestBuilder withRequester(
       this.tags,
       this.patronComments,
       this.holdingsRecordId,
-      this.searchIndex);
+      this.searchIndex,
+      this.ecsRequestPhase);
   }
 
   public RequestRequestBuilder withProxy(
@@ -350,7 +357,8 @@ public RequestRequestBuilder withProxy(
       this.tags,
       this.patronComments,
       this.holdingsRecordId,
-      this.searchIndex);
+      this.searchIndex,
+      this.ecsRequestPhase);
   }
   public RequestRequestBuilder withNoPosition() {
     return withPosition(null);
@@ -375,4 +383,12 @@ private class PatronSummary {
     }
   }
 
+  public RequestRequestBuilder primary() {
+    return withEcsRequestPhase("Primary");
+  }
+
+  public RequestRequestBuilder secondary() {
+    return withEcsRequestPhase("Secondary");
+  }
+
 }