---
pdfexport: true
module: Electronics
timetoread: True
tutorial: deepdive
alias: tutorials-floor-life-propagation
glightbox: True
---

# Tutorial: Floor Life and Expiration Date Propagation

## Objective

Learn how to configure and validate the propagation of floor life and expiration date during material operations, ensuring that the most critical material conditions are preserved throughout assembly.

---

## Step 0: Validate Preconditions

Before executing propagation, ensure:

- Source materials have:
    - Floor Life defined
    - Expiration Date defined (if applicable)

- The relevant Product Revision has:
    - `SMTPropagateFloorLife = true` (if floor life propagation is required)
    - `SMTPropagateExpirationDate = true` (if expiration propagation is required)

- A valid **BOM** exists (for assembly scenarios)

---

## Step 1: Configure Product for Propagation

- Navigate to the **Product** and enable:
    - `SMTPropagateFloorLife = true`
    - `SMTPropagateExpirationDate = true`

> This ensures that materials of this product, when consumed, will propagate these properties during assembly operations.

---

## Step 2: Prepare Materials

### 2.1 Define Source Material Conditions

- Create or identify consumable materials
- The materials should have set:
    - A **floor life remaining time**
    - An **expiration date**

> Ensure at least one material is more critical (e.g., earlier expiration, lower remaining floor life)

---

![Floor Life Material Information](images/image_4.png)

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### 2.2 Prepare Target Material

- Create or identify the target material (e.g., Board)
- Verify its current:
    - Floor life
    - Expiration date

---

![Floor Life Material Information](images/image_5.png)

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## Step 3: Execute Assembly Operation

- Perform one of the supported operations:
    - Automatic Assemble Material (recommended for this scenario)  
    _(or any supported operation like Assemble, Combine, Compose)_

- Ensure materials are correctly assembled and processed

---

## Step 4: Validate Propagation

- After execution, open the **target material**

- Verify:
    - The **expiration date** is updated to the earliest from source materials
    - The **floor life remaining** reflects the lowest available value

---

![Floor Life Material Information](images/image_6.png)

---

## Expected Result

- Target material inherits the most critical values:
    - Lowest floor life remaining
    - Earliest expiration date

- If the target already had more critical values:
    - No changes are applied

---

## Frequent Configuration Questions

### Why is no propagation occurring?

Check that the product attributes are correctly configured:

- `SMTPropagateFloorLife`
- `SMTPropagateExpirationDate`

### Why is propagation only occurring partially?

Ensure that both attributes are enabled. Floor life and expiration date propagation are independent and must be configured separately.

### Why is the target material not being updated?

The target material may already contain the most critical value. This is the expected behavior.