There is a project adp. In it, a tape form with products, the idea is as follows: the user enters the quantity of goods into the free field, clicks the "Add to cart" button on which the stored procedure is called and adds the entered quantity of goods to another table. I understood how to call a stored procedure and pass a parameter to it from the current record. But I don’t understand how to make it possible to write different values in the free field. Now if you enter into one of them the value is duplicated throughout the column. 
Tell me how to make sure that the values of the free field of one line are not duplicated in the whole column?
