Open Amount For Customer is not getting Calculated Properly

 Hi

We have kept a Credit Limit for the Customers as '1' and whenever there is no excess amount if we try to do the bill the Sales Order should go into the HOLD. But for some customers its not happening when we checked we were able to find some open Amount on checking how the amount is getting calculated we were able to see some lines in the old sales orders which were cancelled. From that lines the amount is getting calculated as open amount.

To over come this we have even run the Repost Program(R42995). But still there was no change still the values are showing the same.