If a user manually generates attachments prior to claim submission, using the Generate Attachments button, PDF files for any invoices being claimed are added as attachments. These highlight the line items being claimed with a tick.
If the user make subsequent changes, the invoice attachments are not regenerated i.e. the ticks are not updated to reflect which line items are actually being claimed.
At this stage,the workaround is to manually delete any invoice attachments prior to claim submission.
They will be recreated with the latest instance of the line items being claimed.