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Acumatica 2026 R1 Modern UI – Classic UI Custom Fields Not Showing After Conversion

  • September 1, 2026
  • 4 replies
  • 105 views
Freshman I
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Hi all,

Does anyone know how to display custom fields from the Classic UI after converting a screen to Modern UI in Acumatica 2026 R1?

I have existing custom fields that were working correctly in the Classic UI. After converting the screen to Modern UI, the custom fields are no longer displayed.

I have tried several approaches, including Screen Configuration, but I still cannot get all of the custom fields to appear.

Has anyone faced this issue in Acumatica 2026 R1 and can advise on the correct way to migrate/expose existing Classic UI custom fields in Modern UI?

Any guidance would be greatly appreciated.

Regards,
Lalith

Best answer by jinin

Hi ​@Lalith ,

The Classic → Modern UI conversion does not carry DAC extension fields into the Modern UI layout, and Screen Configuration only exposes UDFs, not UsrXxx fields from a customization project. So both are expected behaviour today.

If your fields are UDFs (attribute-based):
Open the screen → Tools → Screen Configuration → click the Tools icon on the section you want → expand User Defined Fields → select the field. You can drag it in the list to set its order. There is no separate UDF tab in Modern UI any more.

If your fields are DAC extension fields (UsrXxx):
They have to be added per screen, per field:
1. Customization Project Editor → open the screen
2. Click Modern UI Editor
3. Add Field → select the Data View → select the DAC → select your extended field(s)
4. Save to Extension → Save
5. Publish the customization project

This generates the TS/HTML extension files for you. Nothing syncs automatically from the Classic layout.

Hope this helps!

4 replies

jinin
Pro I
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  • jinin
  • Pro I
  • Answer
  • September 1, 2026

Hi ​@Lalith ,

The Classic → Modern UI conversion does not carry DAC extension fields into the Modern UI layout, and Screen Configuration only exposes UDFs, not UsrXxx fields from a customization project. So both are expected behaviour today.

If your fields are UDFs (attribute-based):
Open the screen → Tools → Screen Configuration → click the Tools icon on the section you want → expand User Defined Fields → select the field. You can drag it in the list to set its order. There is no separate UDF tab in Modern UI any more.

If your fields are DAC extension fields (UsrXxx):
They have to be added per screen, per field:
1. Customization Project Editor → open the screen
2. Click Modern UI Editor
3. Add Field → select the Data View → select the DAC → select your extended field(s)
4. Save to Extension → Save
5. Publish the customization project

This generates the TS/HTML extension files for you. Nothing syncs automatically from the Classic layout.

Hope this helps!

Jini N
    Captain II
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    • Saikrishna V
    • Captain II
    • September 1, 2026

    Hi ​@Lalith 

    You can start with the Coffee & Code – Modern UI session for a basic understanding of Modern UI:

     https://community.acumatica.com/other-developer-topics-290/save-the-date-coffee-code-modern-ui-apr-22-29776

    For the actual customization options, this Acumatica UI Development Guide is also helpful:

     https://beacon.acumatica.com/r/UI-Development-Guide/Customizing-Acumatica-ERP-Forms-in-HTML-and-TypeScript/UI-Customization-Development-To-Add-Elements-to-an-Acumatica-ERP-Form#entry_6

    The second link covers different ways to customize Modern UI forms and add fields/elements.

    Hope this helps!

    SaiKrishnaV | https://www.linkedin.com/in/saikrishna-vaddepalli-aa67b8225
      Freshman I
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      • Lalith
      • Author
      • Freshman I
      • September 1, 2026

      ​@jinin 
      Thank you very much. This is work for me. 

        Freshman I
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        • Lalith
        • Author
        • Freshman I
        • September 1, 2026

        ​@Saikrishna V Thanks

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