diff --git a/package.json b/package.json
index 0eba895..562ba6e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@pagopa/interop-outbound-models",
-  "version": "1.0.12h",
+  "version": "1.0.12i",
   "description": "PagoPA Interoperability outbound models",
   "main": "dist",
   "type": "module",
diff --git a/proto/v2/purpose/purpose.proto b/proto/v2/purpose/purpose.proto
index 267af7c..e4f26db 100644
--- a/proto/v2/purpose/purpose.proto
+++ b/proto/v2/purpose/purpose.proto
@@ -15,6 +15,7 @@ message PurposeV2 {
   optional int64 updatedAt = 11;
   bool isFreeOfCharge = 12;
   optional string freeOfChargeReason = 13;
+  optional string delegationId = 14;
 }
 
 message PurposeVersionV2 {