GENERATED_KEY returns NULL if used in INSTEAD OF INSERT Triggers in DDL files

The issue arrised in:

https://developer.jboss.org/message/989700#989700

Following sceanarios are given:

Variant 1:

Table Product(id), primary key = autoincrement;
Table QuicklyAddedProduct, primary key is foreign key on Product.id
Table Diary_SRC
View Diary on Diary_SRC

INSTEAD OF INSERT Trigger on Diary should :
-create new record on Product,
-get autoincremented Product.id of new record,

• create new QuicklyAddedProduct with returned Product.id as primary key
• create new Diary record with QuicklyAddedProduct { INSERT a new record on Product; idProduct = CONVERT(GENERATED_KEY('idProduct'),long); // fails }

Variant 2:
INSTEAD OF INSERT trigger on Diary should :

• create new QuicklyAddedProduct
• add Quickly added prodcut to Diary

additionally a INSTEAD OF trigger on QuicklyAddedProduct exists which:

• creates new Product record
• uses returned GENERATED_KEY(Product.id) to add record on QuicklyAddedProduct with Product.id as primary key