Question on JDBC Adapter

Hi,

Assume that i have a scenario where in I need to update some data in MS SQL from SAP.

For instance, some one pushed junk data from SAP,(but this data is matching to our XML structures) and before I update this data in MS SQL, i need to validate data by connecting through JDBC adapter.

Now when I connect to database using JDBC, is it possible for me to validate the data in the adapter and if data is invalid, how can I update the IDoc status in the adapter or notify Integration Engine that data is erroneous?

Thanks,