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Resolving "The Field Cannot Be Bound to a FieldState" Error in Acumatica Modern UI

28 January 2025

When extending the Modern UI in Acumatica to include custom fields, you may encounter the error:

"The field [FieldName] cannot be bound to a FieldState."

This error commonly arises when attempting to bind a custom field to the UI without defining it properly in the underlying data access class (DAC). Here’s a guide to resolve this issue.

Understanding the Error

This error occurs because Acumatica's framework requires all custom fields referenced in the UI to be defined in the corresponding DAC (Data Access Class) as part of its metadata. Without this, the framework cannot properly associate the field with its state and properties.

Reproducing the Issue

Suppose you have the following setup:

HTML File:

<template>

    <field name="UsrICProjectID"

        after="#columnSecond-DocumentHeader [name='ProjectID']">

    </field>

    <field name="UsrICProjectTaskID"

        after="#columnSecond-DocumentHeader [name='UsrICProjectID']">

    </field>

</template>

TypeScript File:

import { ARInvoice } from '../AR301000'; 

import { PXFieldState, PXFieldOptions } from 'client-controls'; 

export interface ARInvoice_GPGeneral extends ARInvoice { } 

export class ARInvoice_GPGeneral { 

    UsrICProjectID: PXFieldState<PXFieldOptions.CommitChanges>; 

    UsrICProjectTaskID: PXFieldState; 

}

Attempting to load the UI with these definitions will throw the error since the fields UsrICProjectID and UsrICProjectTaskID are not defined in the corresponding DAC.

The Solution

To fix this, you need to extend the relevant DAC and define the custom fields as follows:

DAC Extension:

Key Points:

  1. Define Fields in DAC: Use the PXCacheExtension class to extend the base DAC and define your custom fields.
  2. Add Metadata: Use attributes like PXDBInt and PXUIField to define database and UI properties.
  3. Declare Field Classes: For each field, declare an abstract class to allow referencing in BQL queries.

Testing the Solution

Once the DAC extension is in place, reload the customization in Acumatica and navigate to the screen. The custom fields should now bind properly to the UI without errors.

Conclusion

Customizing the Modern UI in Acumatica can be straightforward if you follow the framework's requirements. Always ensure your custom fields are defined in the corresponding DAC before referencing them in the UI. This approach avoids binding errors and ensures a smooth development experience.

Looking to customize your Acumatica instance? If you're facing issues with binding custom fields or need expert help to extend the Modern UI, our team is ready to assist! Whether you need support with DAC extensions, field definitions, or resolving errors, we provide tailored solutions to meet your needs.

Don’t let customization challenges slow down your development – leave a request for a customized solution today, and let’s get your Acumatica environment working seamlessly!