price books discount do not update the total value on mobile

price books discount do not update the total value on mobile

I am having an issue with updating the discount and the total when creating a sales order from mobile.
From mobile when i create a SO, 
i select the products, 
enter the QTY and 
choose the price books, 
Then i tap on discount field and 
I check "from associated price book" and
tap on Calculate,
the discount value and total do not update, 
the total remain as list price x QTY.

The saving of the SO record still do not show the price book discount to be effective.

When I edit again the newly created SO
it then shows the discount and total updated on their fields.

can you fix this please...

I am on TRIAL evaluation and the time and solution of this issue says a lot to me.