diff --git a/src/ordering/adapters/output/db/errors.rs b/src/ordering/adapters/output/db/errors.rs
index 0c45084..f03a439 100644
--- a/src/ordering/adapters/output/db/errors.rs
+++ b/src/ordering/adapters/output/db/errors.rs
@@ -22,8 +22,10 @@ impl From<SqlxError> for OrderingDBError {
 
                 if msg.contains("cqrs_ordering_store_query_line_item_id_key") {
                     return Self::DuplicateLineItemID;
-                } else if msg.contains("cqrs_ordering_store_query_order_id_key") {
+                } else if msg.contains("cqrs_ordering_order_order_id_query") {
                     return Self::DuplicateOrderID;
+                } else if msg.contains("cqrs_ordering_kot_kot_id_query") {
+                    return Self::DuplicateKotID;
                 } else {
                     println!("{msg}");
                 }
diff --git a/src/ordering/adapters/output/db/kot_id_exists.rs b/src/ordering/adapters/output/db/kot_id_exists.rs
new file mode 100644
index 0000000..5d3486f
--- /dev/null
+++ b/src/ordering/adapters/output/db/kot_id_exists.rs
@@ -0,0 +1,83 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use uuid::Uuid;
+
+use super::OrderingDBPostgresAdapter;
+use crate::ordering::application::port::output::db::{errors::*, kot_id_exists::*};
+
+#[async_trait::async_trait]
+impl KotIDExistsDBPort for OrderingDBPostgresAdapter {
+    async fn kot_id_exists(&self, kot_id: &Uuid) -> OrderingDBResult<bool> {
+        let res = sqlx::query!(
+            "SELECT EXISTS (
+                SELECT 1
+                    FROM cqrs_ordering_kot_query
+                WHERE
+                    kot_id = $1
+            );",
+            kot_id
+        )
+        .fetch_one(&self.pool)
+        .await?;
+        if let Some(x) = res.exists {
+            Ok(x)
+        } else {
+            Ok(false)
+        }
+    }
+}
+
+#[cfg(test)]
+pub mod tests {
+
+    use super::*;
+    //    use crate::ordering::domain::add_product_command::tests::get_customizations;
+    use crate::ordering::domain::kot_aggregate::*;
+
+    async fn create_dummy_kot(kot: &Kot, db: &OrderingDBPostgresAdapter) {
+        sqlx::query!(
+            "INSERT INTO cqrs_ordering_kot_query (
+                    version,
+                    order_id,
+                    kot_id,
+                    created_time,
+                    deleted
+                ) VALUES (
+                    $1, $2, $3, $4, $5
+                );",
+            1,
+            kot.order_id(),
+            kot.kot_id(),
+            kot.created_time(),
+            kot.deleted().clone(),
+        )
+        .execute(&db.pool)
+        .await
+        .unwrap();
+    }
+
+    #[actix_rt::test]
+    async fn test_postgres_product_exists() {
+        let settings = crate::settings::tests::get_settings().await;
+        settings.create_db().await;
+        let db = super::OrderingDBPostgresAdapter::new(
+            sqlx::postgres::PgPool::connect(&settings.database.url)
+                .await
+                .unwrap(),
+        );
+
+        let kot = Kot::default();
+
+        // state doesn't exist
+        assert!(!db.kot_id_exists(kot.kot_id()).await.unwrap());
+
+        create_dummy_kot(&kot, &db).await;
+
+        // state exists
+        assert!(db.kot_id_exists(kot.kot_id()).await.unwrap());
+
+        settings.drop_db().await;
+    }
+}
diff --git a/src/ordering/application/port/output/db/errors.rs b/src/ordering/application/port/output/db/errors.rs
index 43f5eb1..3588c7c 100644
--- a/src/ordering/application/port/output/db/errors.rs
+++ b/src/ordering/application/port/output/db/errors.rs
@@ -14,4 +14,6 @@ pub enum OrderingDBError {
     InternalError,
     DuplicateOrderID,
     OrderIDNotFound,
+    DuplicateKotID,
+    KotIDNotFound,
 }
diff --git a/src/ordering/application/port/output/db/kot_id_exists.rs b/src/ordering/application/port/output/db/kot_id_exists.rs
new file mode 100644
index 0000000..628dabb
--- /dev/null
+++ b/src/ordering/application/port/output/db/kot_id_exists.rs
@@ -0,0 +1,53 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use mockall::predicate::*;
+use mockall::*;
+use uuid::Uuid;
+
+use super::errors::*;
+#[cfg(test)]
+#[allow(unused_imports)]
+pub use tests::*;
+
+#[automock]
+#[async_trait::async_trait]
+pub trait KotIDExistsDBPort: Send + Sync {
+    async fn kot_id_exists(&self, kot_id: &Uuid) -> OrderingDBResult<bool>;
+}
+
+pub type KotIDExistsDBPortObj = std::sync::Arc<dyn KotIDExistsDBPort>;
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+
+    use std::sync::Arc;
+
+    pub fn mock_kot_id_exists_db_port_false(times: Option<usize>) -> KotIDExistsDBPortObj {
+        let mut m = MockKotIDExistsDBPort::new();
+        if let Some(times) = times {
+            m.expect_kot_id_exists()
+                .times(times)
+                .returning(|_| Ok(false));
+        } else {
+            m.expect_kot_id_exists().returning(|_| Ok(false));
+        }
+
+        Arc::new(m)
+    }
+
+    pub fn mock_kot_id_exists_db_port_true(times: Option<usize>) -> KotIDExistsDBPortObj {
+        let mut m = MockKotIDExistsDBPort::new();
+        if let Some(times) = times {
+            m.expect_kot_id_exists()
+                .times(times)
+                .returning(|_| Ok(true));
+        } else {
+            m.expect_kot_id_exists().returning(|_| Ok(true));
+        }
+
+        Arc::new(m)
+    }
+}
diff --git a/src/ordering/application/port/output/db/mod.rs b/src/ordering/application/port/output/db/mod.rs
index 2db807b..14fe72e 100644
--- a/src/ordering/application/port/output/db/mod.rs
+++ b/src/ordering/application/port/output/db/mod.rs
@@ -3,5 +3,6 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
 pub mod errors;
+pub mod kot_id_exists;
 pub mod line_item_id_exists;
 pub mod order_id_exists;
diff --git a/src/ordering/application/services/errors.rs b/src/ordering/application/services/errors.rs
index de37b9e..f27978a 100644
--- a/src/ordering/application/services/errors.rs
+++ b/src/ordering/application/services/errors.rs
@@ -15,6 +15,7 @@ pub enum OrderingError {
     LineItemIDNotFound,
     InternalError,
     OrderIDNotFound,
+    KotIDNotFound,
 }
 //
 impl From<OrderingDBError> for OrderingError {
@@ -30,6 +31,12 @@ impl From<OrderingDBError> for OrderingError {
                 Self::InternalError
             }
             OrderingDBError::OrderIDNotFound => OrderingError::OrderIDNotFound,
+
+            OrderingDBError::DuplicateKotID => {
+                error!("DuplicateKotID");
+                Self::InternalError
+            }
+            OrderingDBError::KotIDNotFound => OrderingError::KotIDNotFound,
             OrderingDBError::InternalError => Self::InternalError,
         }
     }