"Error Message" without interrupting the transaction

We use a VB application to insert/update records in a Oracle database.
Any user is allowed to see all fields, but not every user is allowed to update all fields. We check the right to update in a database trigger and raise an error if a user wants to update a field for which he has no rights.
User X has the right to update field A, but he has not the right to update field B.
Now we want to change the application
If X tries to update fields A and B, we want to accept the new value for A, leave B unchanged and inform the user with a message like an error message without interrupting the transaction.
Has anybody an idea how to implement this?

In the project it's presented:
1) how the servlet can send JSON data depending on the request's parameter
2) how to obtain this data on the client side and show in on the page using jQuery without refreshing the whole site
What You need to do is just to send the error (as JSON data) insetad of the values that are passed now and display this error on the page.

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