Hit counter and Sliced Invoices

Hi, I have had WP statistics plugin for a couple of years, along with Sliced Invoices which I use for my quotations and invoicing of clients.
WP Statistics use to count the hits on my quotes and invoices prior to the ill fated update sometime ago. It was really useful for knowing when they had been read and how often. Helped me out a couple of times when a client would try to suggest they had only just received on invoice for the first time, yet clearly it had been read several times a month earlier!
I can confirm that the hit counters are back working for Post / Pages, and have the option to count all pages enabled, plus track all pages enabled.
Any ideas on how to re-enable the hits counter on the quotes and invoices of Sliced Invoices?
Other than that wee problem, great plugin.
Thanks