Before you perform the BEGIN ISOLATED LOADING statement, the LDILoadGroup Query_Band value must not be set or must be set to NONE for the session.
You cannot issue a BEGIN ISOLATED LOADING statement from a session already performing a load operation. The current load operation must end and you must set the LDILoadGroup reserved query band to NONE before beginning another load operation.
The BEGIN ISOLATED LOADING statement must be the last statement in an explicit transaction.