Java EE (Java Enterprise Edition) General Discussion

Hello!
I'm using JPA with TopLink library and PostgreSQL database server.
I have a class with a BigDecimal field price:

@Entity
public class Price implements Serializable
{
	/**
	 * Цена за единицу услуги.
	 */		
	private BigDecimal price = new BigDecimal(0);

	//...
}

Later in main() function:

//...
Price p = new Price();
BigDecimal bd = new BigDecimal(3.14);	
p.setPrice(bd);
em.persist(p);
//...

bd object has scale = 51 and precision = 52. But JPA maps my field price to a table column of type NUMERIC(38,0). So 3.14 value is stored in database as 3 without fraction part.
Does anybody know why? And how can I control this?
Thank you.

PS: Maybe there is some Annotation which should be applied to my field price?