In this blog post, you’ll learn more about the Sybase Error Positioned update operation attempted on a view with an INSTEAD OF trigger and the reason for receiving this error
Sybase SQL Error Message
Positioned update operation attempted on a view with an INSTEAD OF trigger
Reason for this Error
You attempted a positioned update, positioned delete, put, or wide insert operation that would involve an INSTEAD OF trigger on a view (possibly nested). These operations are not supported with INSTEAD OF triggers on views.