OpenJPA (or for that matter anyone other than the designer) has no way to
know that
private Integer cdProduto;
refers to the primary key of the field
private Produto produto;//read only
You have tell that to OpenJPA.
So what you can do (if the design insist on a arguably erroneous domain
model for all the wrong reasons) to maintain referential integrity is:
public Item(....,Produto p) {
this.cdProduto = p.getCdProduto();
this.produto = p;
}
--
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