Change UoM group in Beas used items

In V10, SAP included a new option to be able to change UoM groups in item master data, even if the item has been used. But I cannot do it with Beas active. I get this error:

There are not any open WO, so I assume I cannot change UoM if I have past WO closed. Is there any possibility to change the UoM group at this situation?