Why PO shipment line didn't change its status from 'Closed for Invoice' into 'Open' when there is a

Hi,

Here's the thing.

When the quantity of a PO shipment line is totally billed, which means quantity of the PO shipment line = quantity billed of the PO shipment line, the status will automatically turn into 'Closed for Invoice'.

And when there is a return,  'Closed for Invoice' should turn to 'Open' in my opinion. But it still keeps the status 'Closed for Invoice' after a PO return.

By the way, the po return happens after 6 months when all the quantity of the shipment is billed.

Bajagali