Problem with Custom Fields

I created a Custom Field for each Customer named Country to show what Country the customer is in.

I add this field to the Sales by Item Detail Report as a Column.

But the country I entered into the Custom Field for the Customer does not appear.

Why?

I then added the Custom Field to the Invoice... where it appeared blank with no data in it... even though I had entered a Country when I creaded each Customer.

I can enter the Country into the field in the Invoice and it shows up in the Sales by Item Detal Report...

But... why, since I entered the Country when I created the Customer... doesn't the Country show up when I add the field to the "Sales by Item Detail Report" or the Invoice?

thanks for any help - Will