Smart links in products linking to wrong customer

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Has anybody experienced this who can help, currently on the phone to Sage but it's been over an hour now and no further to fixing it! (update after 1 hour 20, we got into quite a debate and I hung up!!)

When viewing product activity I used to be able to click the little arrow which would direct me to the invoice that the product related to. Since updating to version 25 it links me to an invoice however it's incorrect. For example, if the sales order for product A is 123 it takes me to invoice 123, this will be the wrong customer and won't have product A on it at all. What it should be doing is sending me to invoice 456 that was generated from sales order 123. I've also noticed that anything invoiced since the update has no link at all.

Can anybody help? This has happened to us in the past and we was sent a hotfix link but apparently this can't be done now. I did find article 14794 which advises certain tick boxes in Invoice & Order Defaults, Update Ledgers, however I've not found this very useful at all.

Thank you