I'm doing a invoice upload but getting error "Please specify a discount item for this customer" why am I getting that error

AI generated answer (using internal Slack threads):

The error message "Please specify a discount item for this customer" typically occurs when you're trying to apply a discount to an invoice, but the customer record doesn't have a default discount item specified. In NetSuite, if you have the feature 'Discount Items' enabled, you can specify a default discount item for each customer. This discount item will be automatically applied to any transactions for that customer. If you're trying to apply a discount to an invoice for a customer, but haven't specified a default discount item for that customer, you'll get this error message. To resolve this issue, you can either specify a default discount item for the customer in their customer record, or manually add a discount item to the invoice when you're creating it. Remember, if you're using a script to create the invoice, you'll need to include the discount item in the script. Here's a sample code snippet for adding a discount item to an invoice:

javascript
var invoiceRecord = record.create({
    type: record.Type.INVOICE,
    isDynamic: true
});
// Add other necessary fields
// ...
// Add the discount item
invoiceRecord.selectNewLine({
    sublistId: 'item'
});
invoiceRecord.setCurrentSublistValue({
    sublistId: 'item',
    fieldId: 'item',
    value: discountItemId // replace with your discount item internal id
});
invoiceRecord.commitLine({
    sublistId: 'item'
});

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