diff --git a/cs/v1/CS_v1.0.4.yaml b/cs/v1/CS_v1.0.4.yaml
index 4c28d8f3..d5b0af11 100644
--- a/cs/v1/CS_v1.0.4.yaml
+++ b/cs/v1/CS_v1.0.4.yaml
@@ -1051,6 +1051,21 @@ components:
             $ref: '#/components/schemas/CutOffTime'
         location:
           $ref: '#/components/schemas/TransportCallLocation'
+        isCargoOperationalCall:
+          type: boolean
+          default: true
+          description: |
+            Indicates whether cargo loading and/or discharge is applicable at the transport call.
+            - `true`: cargo loading and/or discharge is applicable.
+            - `false`: cargo loading and/or discharge are not applicable.
+            - If omitted, the value **MUST** be interpreted as `true`.
+
+            The property is independent of whether the associated timestamps are Planned (`PLN`), Estimated (`EST`) or Actual (`ACT`). It does not indicate whether cargo was actually loaded or discharged.
+
+            Other activities, such as bunkering, do not change this classification when cargo operations are also applicable.
+
+            Consumers requiring only cargo-operational calls can filter out calls where this property is `false`.
+          example: false
         timestamps:
           type: array
           minItems: 1
diff --git a/cs/v1/README.md b/cs/v1/README.md
index f027d5b1..4ac424c5 100644
--- a/cs/v1/README.md
+++ b/cs/v1/README.md
@@ -3,6 +3,14 @@
 The DCSA Commercial Schedules API is specified on [**SwaggerHub**](https://app.swaggerhub.com/apis/dcsaorg/DCSA_CS).
 
 <a name="v104"></a>[Release v1.0.4](https://app.swaggerhub.com/apis-docs/dcsaorg/DCSA_CS/1.0.4)
+---
+Identify cargo-operational calls in Vessel Schedules.
+
+- Added optional `isCargoOperationalCall` to `TransportCall` in Vessel Schedules to indicate whether cargo loading and/or discharge is applicable at the call.
+  - If omitted, the value **MUST** be interpreted as `true`.
+  - `false` indicates that neither cargo loading nor cargo discharge is applicable, allowing consumers to filter these calls while retaining access to the complete published vessel rotation.
+  - The classification is independent of Planned (`PLN`), Estimated (`EST`) or Actual (`ACT`) timestamps and does not indicate whether cargo was actually loaded or discharged.
+  - Calls combining cargo operations with other activities, such as bunkering, remain cargo-operational.
 
 <a name="v103"></a>[Release v1.0.3 (12 June 2026)](https://app.swaggerhub.com/apis-docs/dcsaorg/DCSA_CS/1.0.3)
 ---