On existing invoices, it would be nice to be able to see the primary contact and their phone number on the invoice screen.
If i'm to look at overdue invoices, click on a particular invoice that...
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Thanks for your suggestion Erictrician I can certainly see how having the contact information visible on the invoice screen would make it easier to contact your clients. Anyone who would like to see this in a future update, please cast your vote here.
Another user has raised a suggestion to be able to click into contacts from within recorded invoices. This may also be of interest to you, and you can vote for it here.