If we are inserting XML data into our leads module via insertRecords method, is there any way to not show that was successful based on parameters?

For example,

We don't want to accept FL leads.

<FL val="State">FL</FL>

When this xml data is executed, I want to get a response that says record was not successfully inserted.

Is the only way to do this through a webhook?

Or is there a way for that success (as in screenshot) to show up as not successful?