diff --git a/gso/workflows/iptrunk/create_iptrunk.py b/gso/workflows/iptrunk/create_iptrunk.py
index 213a264b3d6b44117909561ff8e3063e58621298..5afacafe8e504bd78d58854dd4f1d65547eae9b2 100644
--- a/gso/workflows/iptrunk/create_iptrunk.py
+++ b/gso/workflows/iptrunk/create_iptrunk.py
@@ -36,6 +36,7 @@ from gso.utils.helpers import (
     validate_interface_name_list,
     validate_iptrunk_unique_interface,
     validate_router_in_netbox,
+    validate_tt_number,
 )
 
 
@@ -57,8 +58,15 @@ def initial_input_form_generator(product_name: str) -> FormGenerator:
         iptrunk_speed: PhyPortCapacity
         iptrunk_minimum_links: int
 
+
+        @validator("tt_number", allow_reuse=True)
+        def validate_tt_number(cls, tt_number) -> str:
+            return validate_tt_number(tt_number)
+
+
     initial_user_input = yield CreateIptrunkForm
 
+
     router_enum_a = Choice("Select a router", zip(routers.keys(), routers.items(), strict=True))  # type: ignore[arg-type]
 
     class SelectRouterSideA(FormPage):