Multi-row insert in master-detail tables

Question

Hi, I'm using jdev 10.1.3.2 with jheadstart and my problem is:
I hava a master-detail structure, both are tables and my goal is that I want multi insert (exactly 3) in master and detail table when user makes new order(some business scenario). I cannot create rows in master or detail VO by overriding create() method because its entities have complex primary keys and some part of this key is populated by the user with lov. So I set in jhs new rows to 3 and checked multi-row insert allowed but the problem is that overall I can only create rows in master table after I submit form. I want to create row in master table and fill rows in detail table, and after that I want to have opportunity to create second (or even third) row in master table and fill rows in detail table.
thanks for help.
Piotr

Answer 1

See JHS DevGuide: 3.2.1. Review Database Design:
If you are in the position to create or modify the database design, make sure all
tables have a non-updateable primary key, preferably consisting of only one
column. If you have updateable and/or composite primary keys, introduce a
surrogate primary key by adding an ID column that is automatically populated.
See section 3.2.4 Generating Primary Key Values for more info. Although ADF
Business Components can handle composite and updateable primary keys, this
will cause problems in ADF Faces pages. For example, an ADF Faces table
manages its rows using the key of the underlying row. If this key changes,
unexpected behavior can occur in your ADF Faces page. In addition, if you want
to provide a drop down list on a lookup tables to populate a foreign key, the
foreign key can only consists of one column, which in turn means the referenced
table must have a single primary key column.
Groeten,
HJH