We need to change the UOM from EACH to FEE on certain products. While I can do this fine, I cannot change their related opportunity products because they've already been created with a UOM of EACH. Due to this mismatch, I cannot even open the opportunity product because an exception is thrown. Therefore data import also fails.
I need to be able to mass update the opportunity products from EACH to FEE (to match the UOM on the product). Is there a way to achieve this?