Hi there, peter-shattock.

It's possible that the income account for the items used in these sales transactions may be set to Services instead of Income. Let me share some steps to check if that's the case. 

Here's how:

1. Identify which item or service is used the sales transactions. 
2. Once done, go to the Gear icon and select Products and Services.
3. Look for the item and click Edit.
4. Scroll-down a bit to the Income account field and check if it's set to Services.
5. Change the income account if necessary and click Save and close. 

Then, go back to the Profit and Loss report and check if the sales transactions are already listed under Income.

I also have these articles to share with you to add more details about running reports:

• Customise reports in QuickBooks Online 
• Memorise reports in QuickBooks Online 
• Export your reports to Excel from QuickBooks Online 

Let me know if you need anything else.