Two customer invoices produced in 2015 on Sage do not show the correct data.  The invoices are showing on the correct customer record but when I drill into them to reprint them for the customer, they are showing completely different data.  One of them is showing as a credit for a different customer and one is showing as a credit note but in no way relates to the original invoice.  On the activity tab of the customer the invoices are showing as the outstanding and the correct amounts.  This is most confusing, I have never come across this in Sage before, I need to be able to reprint the invoices for the customer but don't know how or if I can correct the data.  It is also concerning as I'm not sure now how reliable the data from 2015 was?!  It is bizarre and I need to get an answer somehow so any help would be greatly appreciated.  Thanks