VMC buffer overflow when Updating reading pricing for each bid.

HI Experts ,

We have write a report program , that updating, reading pricing for each bid .We are reading in range like for last 3 month or 6 months.

So data reading & updating pricing is in loop . So when 40 line item data processed then we are getting dump related to VMC memory overflow .

How we can overcame this issue . Is there any way to clear buffer after every BID or line item of loop .

Please help and suggest .

Thanks in Advance ,

Rishi verma