diff --git a/src/recipe_functions/common.rs b/src/recipe_functions/common.rs
index b3b9294..1718b10 100644
--- a/src/recipe_functions/common.rs
+++ b/src/recipe_functions/common.rs
@@ -125,11 +125,15 @@ pub fn get_mat_prefix(country: &str) -> String {
 pub fn check_allowed_change_mat_prefix(mat_id: Value) -> bool {
     let mat_id_i = mat_id.as_i64().unwrap();
 
-    let exception_list = [
-        2101, 1031, 1, 9100, 8101, 8102, 8111, 8112, 8113, 8114, 8115, 8116, 8117, 8118, 8119,
-        8120, 8001, 8002, 8888, 8889, 200000, 201001, 201002, 100004, 0,
+    let mut exception_list = vec![
+        2101, 1031, 1, 9100, 8101, 8102, 8001, 8002, 8888, 8889, 200000, 201001, 201002, 100004, 0,
     ];
 
+    // topping slot
+    for i in 1..21 {
+        exception_list.push(8110 + i);
+    }
+
     !exception_list.contains(&mat_id_i)
 }