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

# Serial Number

> Step-by-step guide to configuring and using serial numbers, including instructions, expected results, and frequently asked questions. Available on all editions (Free plan, Basic edition, Professional edition, and Dedicated edition).

| **Feature**   | **Free plan** | **Basic edition** | **Professional edition** | **Dedicated edition** |
| ------------- | ------------- | ----------------- | ------------------------ | --------------------- |
| Serial number | Not supported | Supported         | Supported                | Supported             |

Configure serial numbers for a form in [Basic settings](/yida/form/un4nkn).

Once serial numbers are enabled, a serial number is automatically generated each time a new form instance is submitted.

## 1. Steps

### 1.1 Configuration Path

Form page >> Settings >> Page settings >> Basic settings >> Automatically generate a serial number after the user submits the form or workflow.

Form settings

### 1.2 Edit the Serial Number Format

Click **Edit**. In the serial number format dialog box, configure the prefix, date format, minimum suffix length, time zone for date calculation, and suffix reset rule.

Configure the serial number format

### 1.3 Complete the Configuration

**Note**: After clicking **Confirm** in the serial number format dialog box, also click **Save** under **Basic settings** for the configuration to take effect.

Save the settings page

## 2. Final Result

### 4. System Serial Numbers Can Be Upgraded to Serial Number Components

For existing forms that already have the system serial number enabled, you can replace it with a serial number component to expand the scenarios in which the serial number can be consumed.

* Click **Sync form system serial number**. After the upgrade, the component can be used in features such as integration & automation. However, this action is irreversible and applies only to new data added to the current form. In addition, the serial number counting logic is recalculated based on the component configuration rules. Proceed with caution.

For detailed configuration, see the new [Serial number](/yida/form/vanx1ycppgpz5rsk).

| **Before upgrade: Form settings > System serial number** | **After upgrade: Form designer > Serial number component** |
| -------------------------------------------------------- | ---------------------------------------------------------- |

## 3. FAQ

<AccordionGroup>
  <Accordion id="q1" title="3.1 How do I populate a serial number into a form field?">
    Populate a serial number into a form
  </Accordion>

  <Accordion id="q2" title="3.2 How do I populate a serial number into a workflow field?">
    Populate a serial number into a workflow form
  </Accordion>

  <Accordion id="q3" title="3.3 Can I edit the serial number generated after a form is submitted in the Professional edition?">
    The built-in system serial number field cannot be edited. However, if the serial number is generated by a function on a workflow form, this synchronously generated serial number can be edited.
  </Accordion>

  <Accordion id="q4" title="3.4 If the number of submitted forms exceeds the minimum suffix length before the reset time, will the serial number be recalculated?">
    No. The serial number automatically carries over. For example, if the minimum suffix length is set to 1, the 10th submitted record is automatically displayed as 10.
  </Accordion>

  <Accordion id="q5" title="3.5 How do I insert a serial number into the Target form?">
    A serial number is generated by the system only after a form is submitted, so it must be populated back into the form field. Insert a serial number into the Target form using either of the following methods:

    Method 1: For a regular form, configure [business rules](/yida/form/dssg6y) to run when the form is in edit state.

    Method 2: Use [integration & automation](/yida/integration/gqmveiswrxkgxu9s) to add serial number data to the Target form.
  </Accordion>

  <Accordion id="q6" title="3.6 How do I use a component value (variable) from the form as the prefix of the system serial number?">
    On the serial number configuration page, enter `${componentUniqueIdentifier}` in the prefix input box, as shown below:
  </Accordion>
</AccordionGroup>