Validating BDC data

Hi,

I have a BDC requirement. We have a 'Test' check box in the selection screen where if the 'Test' check box is checked, we only need to check for the errors for the given data (or record). We have 2 options for this:

1) Manually validate the data in the file

2) Run the BDC with out saving the transaction. I.E don't execute the 'SAVE' command in the BDC by putting some condition like 'If the checkbox is checked, that 'SAVE' command should not be executed.

Both the cases, we can get the errors, if any.  Now, my question is can you please tell me which one is the best option and can we go for the 2nd option?

Thanks

Mahidhar