---
alias: collapse-material
description: "This documentation details the process of merging sub-materials back into a main material"
---

# Collapse Material

:lock: Material.**Collapse**

## Overview

This operation is used to Collapse **Material**, which is the reverse operation of Expand **Material**. It essentially merges **Sub-Material(s)** back into a Main **Material**.

## Setup

No special setup is required other than to meet the preconditions of the transaction.

## Preconditions

* Main **Material** and **Sub-Material** are Active, not On Hold and not In Transit.
* For the Top-Most **Material**:
    * The Pick List Item Count must be empty.
    * The In Transfer Order Item must be empty.
* For both the Main **Material** and the **Sub-Material**, the Open Defect Count must be zero.
* The Main **Material** and **Sub-Material** Package Count must be empty.
* To be collapsed, **Sub-Material** must belong to the same Main **Material** and must have the same: Facility, Type, and Product.  
* When the collapsed Sub-Material quantity is placed in the same container/position as the Main **Material**, and the associated **Container** has Capacity Validation Mode set to Units, it must be ensured:
    * The Capacity Per Position of the **Container** can hold the Main **Material** and the additional Sub-Material quantity - whether Primary or Secondary, as defined in the Capacity Units of the **Container**.
* If Main **Material** or **Sub-Material** are associated with a Production Order, the Production Order must not be Closed.
* The Main **Material** and the **Sub-Materials** must not have any open defects (Open Defect Count is zero).
* If Top-Most **Material** Current Assembly Type is Automatic At Track-In, Explicit Add, Explicit Long Running or Packing, the Collapse Material operation is not possible.

## Preconditions for Bulk

* In addition to the preconditions mentioned above, all Sub-Materials must:
    * Have the same Parent **Material**.

## Sequence of Steps

### Step 1

1. Verify the **Material** information.
2. Select the **Sub-Materials** to be collapsed into the Parent **Material** by selecting the respective checkbox.

    !!! note
        At least one Sub-Material must be selected to perform the operation.

3. Optionally, enter a comment.
4. Select **Collapse** to complete the operation.

![Screenshot showing a UI with options for selecting sub-materials to be collapsed.](images/collapse_material.png)

!!! info
    Sub-Materials future holds are not copied to the Main Material.

!!! info
    If a collapsible Sub-Material has Sub-Materials, these will be collapsed as well.