I've had a look at this and it's not possible AFAIK because drill down effectively runs another report  based on the parameters passed. There's no way of linking directly to an invoice.

It sounds a good idea if you have lots of disputes / large customer base.

Have you tried the Chase Debt option on the Customer list display. It might help you  It has Disputes as a filter.

That's really useful info - thank you!

This idea stemmed from the existing 'Aged Debtors Analysis (Drillable)' Report which does enable a drill-down to an invoice rather than a report - I was hoping to replicate this in a custom designed 'Customer Invoice Disputes (Drillable)' report. It's unfortunate that this function is not available in report designer as I'd use it in all kinds of custom reports. Perhaps I will suggest it to Sage?

I will most certainly look into the Chase Debt option on the Customer list display (Thank you also for the screenshot to help me find it!) - I can see that the Chase Debt screen displays a column to indicate disputed invoices so this is also helpful.

Thanks very much Ken!