deleting line itmes not effecting condition records -?

Hi Experts

In my order first time discounts are working fine.

If I add any new line items then also working fine.

But when I deleted line itmes from the order the discount is not effecting as like previous. That means when ever I deleted line item my condtion records are not reading immediately according to my settings.

If I cahange the quantity again for the remaining line item then its working fine.

<b>(Hope experts understand this problem)</b>

Do I need to configure some where to effect correctly my condition record or do we need to use any user exit for the cahnge in the order or deleting the line item in the order?

Any thoughts will be great help ful to me.

Thanks

Prasad