When using the API and writing back a custom value on an item line, it keeps giving an error about not having an amount for the item line even though we are trying to update an item line and not create a new one. We want to use the lineuniquekey to push updates.

AI generated answer (using internal Slack threads):

When updating an item line using the API, you might encounter an error about not having an amount for the item line even though you are trying to update an existing item line and not create a new one. This issue can occur due to the way NetSuite handles line item updates. In NetSuite, when you update a line item, it's treated as if you're deleting the old line and adding a new one. This is why it's asking for an amount, even though you're just trying to update a custom field. To resolve this issue, you need to ensure that all mandatory fields for the line item are included in your API request, even if you're only trying to update a single field. This includes the 'amount' field. Here's a sample code snippet that demonstrates how to update a line item:

javascript
var record = nlapiLoadRecord('salesorder', 123);
record.selectLineItem('item', 1);
record.setCurrentLineItemValue('item', 'amount', 100);
record.commitLineItem('item');
nlapiSubmitRecord(record);

In this example, even though we're only updating the 'amount' field, we're still including all the mandatory fields in the API request. This should prevent the error from occurring. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******