Calling a runmodal page

Dear All,

I have got a page which enables the user to insert the amount in one of the payment methods. If the payment method is of type cheque (check) then a page is released using runmodal in whcih the user is prompted for the account information and the cheque number. Now for some reason the cheque number is being updatedd with a delay. The example below shows the scenario

If i insert amount 200, and update the cheque number to 123 the cheque number would not be updated
If after I amend the amount to 100 and update the cheque number to 456 the cheque number gets updated with the number 123

I am using a simple page.runmodal and passing the record. The pages use a different base table so as to avoid having errors of the type: Records has been amended by another user........

Thanks in advance.

Steve