My aim is -
Suppose in a data pool there are 7 values input for a text box.
Out of that 7, 3rd value did not qualify the validation for the text box.
In this case the RFT script should not stop running, it should skip the 3rd datapool value and continue taking the 4th,5th and so on values from the datapool.
What kind of error is reported when the script fails after the 3rd DP value? This sounds like you might have an error with the flow of your test.
For instance, after you submit valid data to your text box you might have to click a button to return to the previous page or section of the application that you are testing. If your 3rd DP value contains invalid data then the application will not advance to the next part and should return an error.
If that is the case you need to add logic to check for the error, update your RFT report and then continue to the next DP value.