---
title: "Add serialized items to invoices in the ServiceTitan Field Mobile App"
slug: "add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app"
tags: ["Area - Field Mobile App (FMA)", "Focus - Construction", "Focus - Service Replacement", "Role - Technician", "Type - Commercial", "Type - Residential"]
updated: 2026-10-29T14:32:48Z
published: 2026-10-29T14:32:48Z
canonical: "help.servicetitan.com/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.servicetitan.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Add serialized items to invoices in the ServiceTitan Field Mobile App

## Overview

Track individual inventory items using unique serial numbers when you add them to invoices. Serialized inventory is especially important for high-value equipment like furnaces, water heaters, and HVAC units. This helps you maintain accurate inventory records for warranty claims and service history.

---

### 

#### Who uses this feature

- Technicians
- Applies to all business types
- Primarily benefits HVAC and Plumbing trades

#### Feature configuration

- The Field Mobile App is optimized for iOS, iPadOS, and Android phones and tablets. For more, see [System requirements and mobile app information](/v1/docs/system-requirements).
- If you're using the Field Mobile App and need support, please contact [Technical Support](http://go.servicetitan.com/ask) (through the office) or reach out directly to [support@servicetitan.com](mailto:support@servicetitan.com).
- Account configuration and [office setup](/residential-s-r/docs/serialized-inventory-home) are required to use this feature. Please contact your office for details.
- The *Add Estimate and Invoice Item* permission is required to use this feature. Please contact the account administrator on your team.

## Things to know

- Before you can use this feature, your office must first:
  - Configure [serialized inventory](/residential-s-r/docs/get-started-with-serialized-inventory)
  - [Identify and serialize inventory](/residential-s-r/docs/identify-and-serialize-inventory) and mark Pricebook items as *Tracked by Serial Number*
  - [Receive and track serialized inventory](/residential-s-r/docs/receive-purchase-orders) through purchase order (PO) and inventory workflows
  - Configure [inventory locations for warehouses and trucks](/residential-s-r/docs/set-up-inventory-locations-trucks-and-warehouses-7)
- For items on your truck, you can assign serial numbers even when offline.
- You must assign serial numbers to serialized items before completing a job. The Field Mobile App alerts you if serialized items are missing serial numbers when you try to complete a job.
- Installed equipment generated from serialized inventory will generate a piece of installed equipment for each quantity of the invoice item.
- The names of certain screens, tabs, and so on may be different based on your selection in **Menu** ![](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/icon-grid-view-outline.png?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D) **> Settings**. For more, see [Show Residential or Commercial terms in the ServiceTitan Field Mobile App](/v1/docs/show-residential-or-commercial-terms).

## Best practices

- Review your truck inventory before starting jobs to ensure all serial numbers are loaded in the system.
- Record serial numbers immediately when you unbox new equipment to avoid forgetting later.
- Double-check serial numbers before completing jobs to prevent rework.
- Keep a photo of the equipment serial number label as backup documentation.

## Use cases

- A technician installs a $5,000 furnace and needs to record its serial number for warranty registration.
- A technician replaces a water heater and assigns the serial number so the office can file a warranty claim if needed.
- A technician adds multiple HVAC units to a commercial project and needs to track each unit individually.

## Add a serialized item to an invoice in the Field Mobile App

After your office marks an equipment or material item as *Tracked by Serial Number* in the pricebook, you can scan or manually select the serial number when adding the item to the job's invoice.

### Add a serialized item by scanning the barcode

1. Open your job and tap the **Invoice** tab.
2. Scroll and tap **View** next to *Invoice Items*.
3. On the screen that opens, scroll to the bottom and tap **+ Add Items**.
4. In the pricebook that opens, tap the **Equipment** or **Materials** tab, depending on what you need to add.
5. At the top of the tab, tap the **Scan** ![](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/icon-document-scanner.png?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D) icon. ![User interface showing categories for adding items, including repairs and sorting options.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-bnp7eqyn.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
6. Point your device at the equipment or material you want to scan.
7. Scan the serial number, then capture the image so it can be scanned. ![Trane XV specifications including voltage, amperage, and manufacturing details for HVAC equipment.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-zikljhp3.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
8. If a serialized item match is found, the Field Mobile App pulls it up. Select the **Serial Number** you need from the dropdown. ![Form for Drain Cable Cam with serial number, cost, and description fields highlighted.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-386gyxar.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)

> [!NOTE]
> **Note:** If no serialized item match is found, try adding it manually instead.
9. Finish adding the item to the invoice.

### Add a serialized item manually

1. Open your job and tap the **Invoice** tab.
2. Scroll and tap **View** next to *Invoice Items*.
3. On the screen that opens, scroll to the bottom and tap **+ Add Items**.
4. In the pricebook that opens, search for the material or equipment item you need, then tap **Add**. ![User interface displaying equipment categories with options to add items for repairs.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-c1fb9tfy.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
5. On the *Add Serial Number* screen that opens, find and select the serial number for the specific item available in your truck.

> [!TIP]
> **Tip:** Serial numbers are sorted alphanumerically. Use the search bar to quickly find specific serial numbers.

![User selects a serial number for the Drain Cable Cam from the options provided.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-euxykfwe.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
6. When finished, tap **Select Serial Number**.
7. Finish adding the item to the invoice.

## Change the serial number of an item in the Field Mobile App

If needed, you can change serial numbers on invoice items before completing the job:

1. Open your job and tap the **Invoice** tab.
2. Scroll and tap **View** next to *Invoice Items*.
3. On the screen that opens, scroll to the bottom and tap **+ Add Items**.
4. In the pricebook that opens, search for the material or equipment item you need, then tap the item to open it. ![User interface displaying equipment categories for plumbing repairs and related items.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-uunsyzu8.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
5. In the *Serial Number* field, tap **Select Serial Number**. ![Form for selecting serial number and pricing for Drain Cable Cam equipment.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-u39u134m.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
6. On the *Add Serial Number* screen that opens, select a different serial number, then tap **Select Serial Number**. ![Select the serial number for the Drain Cable Cam from the list provided.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-vd0y67gy.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
7. On the item details screen, the updated serial number is shown. Tap **Add** to finish updating. ![Details of Drain Cable Cam including serial number, cost, and price information.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-bxbb6e7n.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)

## Update the quantity of a serialized item in the Field Mobile App

When you change the quantity of a serialized item, you must also update the serial numbers:

1. Open your job and tap the **Invoice** tab.
2. Scroll and tap **View** next to *Invoice Items*.
3. On the *Items* screen that opens:
  1. Update the quantity of the equipment or material item as needed.
  2. A warning appears stating that the *Serial Number(s) Mismatch*.
  3. Tap the item to open it. ![Selected items list showing missing serial number warning for Drain Cable Cam.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-ptlqccph.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
4. In the Serial Number field, tap **Select Serial Number**. ![Form for selecting serial number and pricing details for Drain Cable Cam.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-tni3bhmp.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
5. On the *Add Serial Number* screen that opens:
  - If you decreased the quantity, deselect serial numbers you didn't use.
  - If you increased the quantity, select additional serial numbers.
6. Tap **Select Serial Number**. ![Select three serial numbers for the Drain Cable Cam from the list provided.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-pkycp3vz.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
7. On the item details screen, the updated serial number(s) are shown. Tap **Add** to finish updating. ![Drain Cable Cam details including serial numbers, cost, and price options displayed.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-1k0ynoij.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)

## Complete a job with serialized items in the Field Mobile App

The Field Mobile App checks for missing serial numbers before you can complete a job:

1. On the *Complete Job* screen, scroll to the *Items Serial Numbers* section.
2. If the section shows items remaining, tap each item to add serial numbers. ![Invoice summary showing items with serial numbers and remaining quantities listed.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-jb5l32ht.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
3. Select and add the remaining serial numbers.
4. After you add all serial numbers, the items show green checkmarks. ![List of items with serial numbers, highlighting the selected Drain Cable Cam.](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/add-serialized-items-to-invoices-in-the-servicetitan-field-mobile-app-image-36wlhopg.jpg?sv=2026-02-06&spr=https&st=2026-11-09T11%3A21%3A33Z&se=2026-11-09T12%3A21%3A33Z&sr=c&sp=r&sig=HcocWOqYtkHeq9vfncGESGVaqJPR%2FqWyWHRcFV7EUNk%3D)
5. Finish completing the job.

## Want to learn more?

- See [Serialized inventory](/residential-s-r/docs/serialized-inventory-home)