AI generated answer (using internal Slack threads):

To customize the hover popup on a transaction line, you would need to create a custom transaction line field. This can be done by navigating to the Customization > Lists, Records, & Fields > Transaction Line Fields > New. In the new transaction line field, you can define the label, type, and other properties of the field. If you want to source it from a native transaction line field on the sales order, you can select the appropriate transactions in the custom line field's record. Make sure to turn on show for that field in the selected transaction's form. If you want to show the local currency amount on each transaction line item, you can create a custom transaction line field with a formula like exchange rate x amount. However, it's important to note that you cannot customize or remove standard GL lines on a transaction. You can only add things. If you need to replace them with a different account as per the condition, you may be able to do that using a custom GL plugin script. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******