---
schema_version: "1"
id: 074f97523ba8cc1e40508bf2f60e595c5d54986539ac44700a73f44079817b2b
title: Modify Standard Auto-Number Fields in Salesforce Classic
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/platform/264-0-0/modifying_standard_auto-number_fields.md
canonical_url: https://help.salesforce.com/s/articleView?id=platform.modifying_standard_auto-number_fields.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 733a52a395c989a6c9c5c49f77c50a1d77ab9dd2da4b230f9d7512d8cc917c36
description: The unique identifiers for solution, case, and contract records are standard auto-number fields. Each record is assigned a unique number with a specified format upon creation. You can modify the format and numbering for these auto-number fields in Salesforce Classic.
products:
  - Salesforce Platform
  - Security
release: "264"
---
# Modify Standard Auto-Number Fields in Salesforce Classic

The unique identifiers for solution, case, and contract records are standard auto-number fields. Each record is assigned a unique number with a specified format upon creation. You can modify the format and numbering for these auto-number fields in Salesforce Classic.

### Required Editions

<table class="slds-table slds-table_bordered slds-max-medium-table_stacked slds-m-bottom_small edition"><colgroup><col></colgroup><tbody><tr class=""><td class="slds-cell-wrap" style="vertical-align:top;">Available in: Salesforce Classic</td></tr><tr class=""><td class="slds-cell-wrap" style="vertical-align:top;">Available in: <strong>Contact Manager</strong>, <strong>Group</strong>, <strong>Professional</strong>, <strong>Enterprise</strong>, <strong>Performance</strong>, <strong>Unlimited</strong>, and <strong>Developer</strong> Editions</td></tr></tbody></table>

<table class="slds-table slds-table_bordered slds-max-medium-table_stacked slds-m-bottom_small permission">
        <colgroup>
          <col style="width:50%">
          <col style="width:50%">
        </colgroup>
        <thead class="slds-text-title_caps ">
          <tr class="">
            <th scope="colgroup" class="slds-cell-wrap" colspan="2" style="text-align:center;vertical-align:top;" id="d95007e83">User Permissions
              Needed</th>
          </tr>
        </thead>
        <tbody>
          <tr class="">
            <td data-label="User Permissions Needed" class="slds-cell-wrap" style="vertical-align:top;" headers="d95007e83 ">To modify standard auto-number fields:</td>

            <td class="slds-cell-wrap" style="vertical-align:top;" headers="d95007e83 ">Customize Application</td>

          </tr>
        </tbody>
      </table>

1. From Setup, enter the name of the object whose field you want to modify in the Quick Find box, then select **Fields**.
2. Click **Edit** next to the name of the auto-number field.
    
    For example, for cases, edit the Case Number field.
3. Enter a Display Format to control such formatting details as the minimum number of leading zeros as well as any prefix or suffix for the number.
    
    For more information, see [Custom Field Attributes](https://help.salesforce.com/s/articleView?id=platform.custom_field_attributes.htm&release=264.0.0&type=5 "A custom field has different attributes depending on its field type.").
    
    Format changes don’t affect existing records; they’re applied only to new records.
4. Enter the number to be assigned to the next record that is created after you save your changes.
5. Click **Save**.

![Warning](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-platform-extend_click-264-0-0-production-enus/5f7d9219-b7b1-4552-8891-f1aba9b289fc/images/icon_warning.png)

Warning Salesforce warns you if the next number you enter isn’t higher than existing numbers. However, it‘s possible to create duplicate numbers if you change the auto-number format multiple times using similar formats each time.

#### See Also

- [Custom Field Types](https://help.salesforce.com/s/articleView?id=platform.custom_field_types.htm&release=264.0.0&type=5 "Salesforce supports various field types, allowing you to select the right one for your data. You can also convert an existing field to a different data type if needed.. When you have data that doesn’t match any of the standard fields, your admin can create a custom field for that data. For example, create a Middle Name field for contacts to capture additional information.")