Hi,
Table A has following keys forming primary keys:
Ayear, Adate, Anumber, Astring

Table B has references to following keys plus some other keys foming the primary key:
Ayear, Adate, Anumber, Astring, Bone, Btwo

How do i correctly map the compiste primary key of Table A with that of table B with its own set of additional keys forming the primary key?

many-to-one or a one-to-many depending which side we are talking about.
The manual has a section on composite keys.

http://www.hibernate.org/hib_docs/reference/en/html/mapping.html#mapping-declaration-compositeid

You could try out a tool like Middlegen and see what it generates.

Its a one-to-many from Table A to Table B. I can create a composite id for table A just fine. Table B has foreign key references to these composite keys + plus its own additional fields that make up its primary key(composite id for Table B).

How do i map this relation in hibernate mapping file?