Good morning and happy Friday. I have a memorized transactions question. Trying to set up an automatic monthly rent payment for 12 months. The schedule looks fine but when it creates a transaction I get this error to enter a reference/invoice number

You could setup a workflow to set the field value upon creation. And probably set it to only run for these created from a memorized transaction

Thanks and do you think it would be possible to give the bill a unique bill # through the workflow?

Yes you could use a few methods to provide a numbering scheme for this