Separate Remittance Advice sent as Email - formatting of email body

Summary:

How can I generate the SRA in email with the formatting in place?

Content (required):

We have created a custom Separate Remittance Advice (SRA) format. When the supplier is set up to receive the SRA as email with PDF attachment, the formatting of the PDF is correct.

When the supplier is set up to receive the SR as email, all the formatting other than Bold and italics is stripped out:

.

I've tested using different default output types in BI Publisher, to no avail.

Any ideas please?

Version (include the version you are using, if applicable):

22D, replicated in several environments