Error in Change sales order of fiori app

Hello experts,

When i am changing the Sales order in fiori app,

After pressing the change address one popup is coming but that is empty. pl verify below screen shot

Even after pressing next nothing is happening.

and cant we change the order quantity in change SO app..?

and cant we add other items in change SO app..?

if yes pl provide the process.

please help me here.

Thanks and regards,

Prasanth.