How to Retrieve the Transaction Internal ID from a Line Item in NetSuite

To retrieve the internal ID of the main transaction record (e.g., a Purchase Order) from a line-item context, the {id} field in a transaction column typically provides the transaction's internal ID directly.However, if a line-level identifier were to present a concatenated string that includes both the transaction ID and the line number (for example, '1925_1'), string manipulation would be necessary to extract only the transaction ID. In such a scenario, the following formula could be used:

SUBSTR({id},0,INSTR({id},'_')-1)

This formula extracts the substring from the beginning of the {id} field up to the character just before the first underscore, effectively isolating the transaction ID.An alternative method involves sourcing the transaction's internal ID into a custom body field on the transaction record. Once the custom body field is populated with the {id} value, its content can then be referenced in any column where the transaction ID is required, simplifying access without complex string functions.