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I'm confused about pkColumnValue parameter  RSS feed

Luk Cora
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I'm following this guide http://www.developer.am/ejb3/?page=generating-primary-keys

There is an example of generated table (throught strategy method):

and i will have



After it say
If we want to store several sequences in the same sequence table, for example a separate sequence for each entity, then we need to manually specify the pkColumnValue element. The following statement sets the pkColumnValue to customer_seq:

@TableGenerator(name="CUST_SEQ", table="SEQUENCE_TABLE", pkColumnName="SEQUENCE_NAME", valueColumnName="SEQUENCE_COUNT", pkColumnValue="CUSTOMER_SEQ")

What the purpose of manually set a primary key considering that i can't have duplicate values??
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