t,UPRC = discount factor - net price calculated by advance pricing

Dear support,

We noticed something very strange, at sales order entry the unit price got updated as -1.68 instead of 33.69

and when i did row exit to check price my price got corrected as 33.69 as shown in screenshot below

But why it took wrong price -1.68 initially which is actually the subtraction of discount factor and unit price (32 - 33.69= -1.68), is this a bug?

Thanks,

Subodh