I created and update query that allows me to take contract prices that I have in an xls spreadsheet and put them into BKICPMAT. It works fine except for every row in the spreadsheet it creats 20 or more entries in the BKICPMAT database. I created linked tables of the xls spreadsheet and of the BICPMAT database.  
 
When creating the BKICPMAT link, I am asked to identify a unique file name, but of course there is none, since CustID and ProdID can be present multiple times.
 
Does anybody know, how to avoid these duplicates?

No,
the problem is not solved.