JPA EntityManager operations order

I have run into interesting issue recently. I use in the project JPA + Hibernate + EJB. The issue concerns saving and deleting entities in the same transaction. Database table which is used has an unique constraint defined on two columns. What I have done was removing entity calling [crayon-594c0a85d1beb802037327/] then the new entity has been added with the same values in two properties associated with columns used in the unique constraint but different values in other properties using: [crayon-594c0a85d1bf2956569226/]

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