---
alias: tutorials-carrier-management-scenario-carrier-capacity
description: "Splits a material across several carriers with capacity tracking, and removes the carriers before the material leaves the cooling step."
---

# Using Carriers With Capacity

## Overview

In many processes, one carrier cannot hold a whole lot. For example, a baking oven uses process trays that hold only part of a lot, so the operator spreads the lot across several trays. In this scenario, a process engineer or operator uses **Carrier Materials** with capacity tracking to split a `150` unit lot across two trays, such as `SRMTray002` and `SRMTray004`, and then removes the trays at the next step.

This scenario extends [[tutorials-carrier-management-scenario-attaching-single-carrier]]. Instead of attaching one carrier to the whole **Material** or to each sub-material, you assign a quantity of the **Material** to each carrier, and the system tracks how much of each carrier is used.

For the overall concepts, see [[tutorials-carrier-management-index]].

## Before You Start

- The **Material** `RTS512/1014054` of **Product** `S512RM08` exists with a quantity of `150` units, in `Queued` state at the `Baking SD` **Step**.
- The **Product** `SRM-Tray` of **Product Type** `Carrier` exists, with at least two **Carrier Materials**, such as `SRMTray002` and `SRMTray004`, each with an available capacity of `100`.
- The **MaterialCarrierCapacity** table defines the capacity of `SRM-Tray` for each **Capacity Class**. For example: `0-50` holds `300` units, `50-100` holds `100` units, and `100-200` holds `40` units.
- The **Capacity Class** of the **Material**, or of its **Product**, matches a class in the **MaterialCarrierCapacity** table.
- The **MaterialCarrierContext** table has an `Add` **Operation** for `SRM-Tray` at the `Baking SD` **Step**, with **Assignment Mode** set to `Main Material` and **Track Used Quantity** set to `true`, and a `Remove` **Operation** for `SRM-Tray` at the cooling **Step**.
- The **Carrier Material Verification Mode** of `Baking SD` is set to `At Track-In`.

!!! info
    For the table and **Step** setup, see [[tutorials-carrier-management-configuration]].

Use the following Master Data Files to load the model for this tutorial:

- [Master Data file 1](masterdata/carrier-materials-capacity-1.xlsx)
- [Master Data file 2](masterdata/carrier-materials-capacity-2.xlsx)

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## Sequence of Steps

### 1. Assign the First Carrier With Partial Capacity

From the `Baking SD` **Step**, assign a tray that covers only part of the lot, and see how the system blocks the process until the lot is fully covered. Open the `Baking SD` **Step** and proceed as follows:

1. On the top ribbon, select the **Step View** tab.
2. Select **Materials** from the left panel.
3. In the **Materials** table, select the `RTS512/1014054` checkbox to set the carrier materials assignment.

    ![Screenshot showing the Manage Carrier Materials wizard with SRMTray003.](images/carrier-materials-with-capacity-frame-0320.png)

4. On the top ribbon, select **More**.
5. In the **Carrier Materials** section, select **Manage**.

    The **Manage Carrier Materials** wizard opens. You can see the number of material units in the title. For example, `400 Unit`.

6. In the **Carrier Material** field, select a tray. For example, `SRMTray003`.
7. Select **Save**.

    ![Screenshot showing the Manage Carrier Materials wizard with SRMTray003.](images/carrier-materials-with-capacity-frame-0331.png)

8. Try to track in the `RTS512/1014054` **Material**.

    The system blocks the operation and displays an error saying that there are not enough carriers, because `50` units still have no carrier.

    ![Screenshot showing the track-in error for missing carrier capacity.](images/carrier-materials-with-capacity-frame-0434.png)

### 2. Assign the Remaining Quantity to a Second Carrier

1. Open the **Manage Carrier Materials** wizard again, as described in Step 1.
2. Select **Add** (`+`) and, in the **Carrier Material** field, select a second tray, such as `SRMTray004`.
3. In the **Assigned Capacity** field, enter `50`, and then select **Save**.

    The wizard lists both trays, and the assigned capacity covers all `150` units.

    ![Screenshot showing the Manage Carrier Materials wizard listing SRMTray002 with 100 Unit and SRMTray004 with 50 Unit.](images/carrier-materials-with-capacity-frame-0471.png)

4. Track in the `RTS512/1014054` **Material**.

    This time, the system accepts the track-in and the process continues.

### 3. Remove the Carriers Before Leaving the Cooling Step

The `Remove` **Operation** in the **MaterialCarrierContext** table requires the trays to detach before the **Material** leaves the cooling **Step**.

1. Move the `RTS512/1014054` **Material** to the cooling **Step**.
2. Try to move the **Material** to the next **Step**.

    The system blocks the operation and displays an error saying that carrier materials must be removed first.

3. Open the **Manage Carrier Materials** wizard, as described in Step 1.
4. Select the trash can icon of each tray to remove it, and then select **Save**.

    ![Screenshot showing the Manage Carrier Materials wizard after removing the trays at the cooling step.](images/carrier-materials-with-capacity-frame-0544.png)

5. Move the **Material** to the next **Step**.

    This time, the system accepts the operation.

### 4. Validate the Result

1. Open the `RTS512/1014054` **Material** page.
2. On the details view, select **Carriers**.

    The list no longer shows `SRMTray002` and `SRMTray004` as assigned carriers.

## What You Learned

You split a lot across two carriers by assigning a quantity to each one, and you saw that the system blocks track-in until the whole lot has carriers. You also removed the carriers at the cooling **Step**, which the **MaterialCarrierContext** table required before the **Material** moved on.