Intercompany Project invoicing - CU7


in CU7 the posting hours and expenses to the project in borrowing legal entity is enabled. i am successfully able to post hours from borrowing legal entity. however when i attempt to post expenses using AP/ Pending vendor invoices, in the Line details, I dont see Legal entity field which will allow me to change to borrowing legal entity and select the relevant project. is there any setup i am missing?

any help will be highly appreciated.