It is possible the Purchase Order in Dimensions has been edited after the order was posted in to Dimensions from FocalPoint. When this happens, the details are not updated back to FocalPoint and therefore this can then lead to a variance when viewing the Purchase Order in Dimensions and FocalPoint.
Unfortunately, we are not able to tell who edited the Purchase Order as this information is not recorded by the system as standard.
You should be able to edit the Purchase Order in the batch window in Dimensions to then either update the lines with the correct quantities, or add additional lines with the correct amounts.
This should then let you match the Purchase Order to an invoice.
Ribbon style menu:
Select Purchasing from the main menu
Click on the Orders button
Click on the Display button to display a list of batched orders
Select/highlight the required Purchase Order in the Process Batch screen
Click the Edit button
Make the required changes and click OK
Module Menus / Classic style menu:
Select Purchase Orders from the navigation bar
Select Process Batch, Orders button
Click on the Display button to display a list of batched orders
Select/highlight the required Purchase Order in the Process Batch screen
Click the Edit button
Make the required changes and click OK