why are the line numbers on an itemreceipt non sequential?

AI generated answer (using internal Slack threads):

The line numbers on an Item Receipt in NetSuite are non-sequential due to the nature of how NetSuite handles line items on transactions. The line ID does not need to be sequential, it just needs to uniquely identify the line on the transaction. When you have items composed of other items like kit, assembly, and group items, this can cause line IDs to increment by more than 1. This is because each component of the kit or assembly item is treated as a separate line item in the background, even though it may not be visible on the user interface. Additionally, the line numbers on an Item Receipt are not supposed to match the line IDs from the Sales Order. They are supposed to match the line IDs from the Return Authorization. If you are seeing non-sequential line numbers even with normal inventory items, it could be due to scripts or workflows that are running on the transaction. If you need to force the line ID to be sequential, you may have to create a custom field to do this. However, please note that this is not a requirement in NetSuite and the system is designed to handle non-sequential line numbers. In the case of Item Fulfillment, the line numbers may appear as 0, 3, 6, etc. but in SuiteScript, you have to access them as 0, 1, 2, etc. This is because SuiteScript uses a zero-based index for line items, whereas the user interface uses a one-based index. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******