Updating Custom Fields with record.submitFields in NetSuite when the field id is stored to a variable.

NetSuite’s record.submitFields method efficiently updates specific fields on a record without loading it. To update the custom field custbody_jj_custfield on a sales order:

const BODY_CUSTFIELD = 'custbody_jj_custfield';

record.submitFields({
    type: record.Type.SALES_ORDER,
    id: soId,
    values: {
        [BODY_CUST_FIELD]: true
    },
    options: {
        enableSourcing: false,
        ignoreMandatoryFields: true
    }
});

Why []?

Use square brackets [BODY_CUST_FIELD] to dynamically reference the field ID (custbody_jj_custfield). Without them, NetSuite looks for a field named BODY_FIELD_ALREADY_PRINTED, causing failure.

Advantage

If the field ID changes, update only the BODY_CUST_FIELD constant. This simplifies maintenance when the field is used across multiple scripts.