Probelem with pricing function module

Hi all,

I am facing a probelm in Pricing fucntion module,Which intrun calls many standard programs,one among the program is LV61AA55 there is a internal table called

xkomv(Pricing condions), it is getting filled but one particular field called kwert is not filled for few line items,can anybody help me to crack the issue,

Please Reply back !!! Urgent

Thanks In Advance