Error event rule automatically reverts the original values of the fields

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Hi,

I wrote a simple error rule that checks the sum of the instances:  Error ("The sum should be 100.") if InstanceSum(all instances of the bank account, the bank account percentage) <>100.  

Actual behavior: the original values of the percentage fields are reverted after I click the Next button and the error message is displayed.  For example, if I changed the value of one field from 10 to 50, the value becomes 10 again after clicking Next button.  I do not like this to happen,

What I want to happen: The error message should be displayed but the value should still be 50.  The user should be the one to update the fields. I do not want OPA to automatically undo the value I entered.  Is there a way to do this?