Developing Invoicing and Inventory management database with FM Pro 11. Tables are Customers, Invoices, LineItems, Part Categories, Parts, Customer Discounts. Customer Discounts are related to Customers with Customer No as the FK. Invoices are related to Customers with the Customer No. as the FK. Line Items are related to Invoices with the Invoice No. as the FK. Parts are related to Part Categories with the Category as the FK. The problem is with the Customer Discounts, which fields are Customer No., Parts Category, and Discount Amt. Everything works fine except the I cannot figure out the relationship structure that allows the customer discount to be applied based on the Part Category and the Customer No. in the line items table for each line item. Any help would be GREATLY appreciated! Screenshot of relationship diagram included.