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Any ideas why this is not working?

`/**`
 `* @NApiVersion 2.1`
 `* @NScriptType UserEventScript`
 `* @NModuleScope SameAccount`
 `*/`

`define(['N/ui/serverWidget', 'N/log'], (serverWidget, log) =&gt; {`
    `function beforeLoad(context) {`
        `if (context.type === context.UserEventType.CREATE) {`
            `hideColumnField(context.form, 'item', 'taxcode');`
        `}`
    `}`
    `function hideColumnField(formObj, item, taxcode) {`
        `try {`
            `const formSublist = formObj.getSublist({`
                `id: 'item'`
            `});`
            `if (formSublist) {`
                `const formField = formSublist.getField({`
                    `id: 'taxcode'`
                `});`
                `if (formField &amp;&amp; typeof formField !== 'undefined' &amp;&amp; formField !== null) {`
                    `formField.updateDisplayType({`
                       `displayType: serverWidget.FieldDisplayType.HIDDEN`
                    `});`
                `}`
            `}`
        `} catch(error) {`
            `log.error({`
                `title: 'Error:',`
                `details: JSON.stringify({`
                    `item: item,`
                    `taxcode: taxcode`
                `})`
            `});`
        `}`
    `}`
    `return {`
        `beforeLoad: beforeLoad`
    `};`
`});`

Not sure why that particular code snipped is not working, but you should be able to hide the columna via Form Customization, a trick that worked for years is to remove the Label of the field meaning blank Label = Hidden while still available for scripts etc/

It typically helps us if you define "not working". Is it just not doing the thing? Is it throwing an error?

It seems to me that your `hideColumnField` function can be reduced to
```function hideColumnField(form) {
  form?.getSublist({ id: 'item' })?.getField({ id: 'taxcode' })?.updateDisplayType({ displayType: serverWidget.FieldDisplayType.HIDDEN })
}```
Less code - specifically, fewer branching `if` statements - should be a little easier to troubleshoot

<https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining|optional chaining> FTW

<@U29PVMVAR> Sorry I did not provide any context. Unfortunately, it's not working at all or doing what I plan on doing with the script which is to hide the taxcode column on sales orders when users create an order. I've also tried Edit and same result.

image.png

Nothing seems to work - I've tried even different fields at the line item level

taxcode still shows up when creating/editing a sales order

its mandatory, I don't think you can hide mandatory fields

<@U9FNFCWRF> I've tried with other fields for the sake of testing and it doesn't work