After you have selected parts and loaded them into the WIP, you have to clear the shopping list transfer file.
Before you select new parts in the flexible EPC, you have to clear the shopping list transfer file. In this file the previous loaded parts are stored and new selected parts will only be added.
To clear the shopping list transfer file you have to select the Review List option from the menu.
Then select the List Utils option, followed by Clear current list (Option 2) and clear the list. Now you can put together a new shopping list.