I want to ensure you get the help you need about the pledge, @casandrah.

To make sure we're on the same page, I'd like to verify if you're trying to change the word pledge from the invoice email subject line. If yes, does the error messages you get is "You have to include the period behind No. You can add additional words in the subject line but you must use [Pledge No.] to generate the invoice number in your subject line"? If no, can you add more details? Any extra information is much appreciated.

We're looking forward to hearing from you. Have a great day!