Removing Values From Standard Sales Order field In Customer Deposit Record

The client wants to unlink the sales order from the customer Deposit based on the payment method in the customer deposit record.

if(scriptContext.type ==  scriptContext.UserEventType.CREATE && (scriptContext.newRecord.getValue({fieldId: 'paymentmethod'}) == 10 ||scriptContext.newRecord.getValue({fieldId: 'paymentmethod'})==11)){
//             let field = scriptContext.form.getField({id: 'salesorder'});
//             field.updateDisplayType({
//     displayType : serverWidget.FieldDisplayType.NORMAL
// });
            scriptContext.newRecord.setValue({fieldId: 'custbody_jj_sales_order_id', value:  scriptContext.newRecord.getValue({fieldId: 'salesorder'})});
            scriptContext.newRecord.setValue({fieldId: 'salesorder', value: ''});
          }