Here is SAGE's Knowledge base information surrounding this issues.  Sure would be great if this known issue could be resolved verse having to enter in multiple Purchase/Receive documents to address the various reasons why items are listed multiple times on a given Purchase Order that must appear on the vendors purchase history as separate purchases each listing the correct unit price verse a consolidated entry with a combined unit cost.

• There are duplicate items on the Inventory List
• When going to Lists, Inventory & Services, Inventory & Services, some of the Inventory Items are listed twice or more times
• On the list view of Inventory Items, some of the Inventory Items are listed twice or more times
• Each listing is the same inventory item with the same Item ID
• When you drill down on any one of them, it takes you to the same Maintain, Inventory Items record

• This is caused by entering the same item on multiple lines on a purchase invoice
• Enter purchase orders in such a way that you have multiple line distributions for the same item, versus having just one line distribution with a Quantity great than 1
• Having multiple transactions like ones listed above at in the system with differing unit prices

1. Open the purchase invoice that contains the multiple lines for one of the duplicate Item IDs
2. Remove all but 1 line for that item
3. Change the quantity to reflect the total ordered of that item on that purchase invoice
4. Click Save
5. Repeat steps 1-4 for each purchase invoice for each item that is showing a duplicate Item ID