F43121 partial receipt and quantity open VS quantity paid

Hello,

We are wondering how works Enterprise One 9.0 for partial receipt and voucher match in file F43121.

Indeed, in case of a partial receipt, two (or several) lines are generated in F43121 and an open quantity is set.

When the voucher is done, the open quantity of the first line turns to zero and the quantity paid updates for the total amount of the invoice.

As a consequence, the second line keeps an open amount and zero qty in qty paid.

Is it normal that an open qty remains on the second line? If not, is it a way to repair?