Just to add:

Inside the Bill in Item Details the Account for my Products (which I selected when creating my Products) is the same as the Account I select in Category Details. If these differ, you will have to add the products in Category Detail line for line, not just a single one-liner with the Total Bill amount.

Also:

I add a note in Memo to give the past Date that payment of the Bill actually went off the bank account. Plus I leave a message to the Accountant in Memo giving the VAT amount to take into consideration for the VAT output recon.