Hi Antenne,
All the times that I've faced the same error message it was because one of
the following two causes:
1. Creating an entity (in your example, Entities\Product) using one
instance of EntityManager and creating the association (OnToMany) entities
(in your example, Entities\Type) using another instance o EntityManager
2. Creating the association entities (in your example, Entities\Type) using
the "new" operator and not setting the cascade={"persist"} option in the
OneToMany association
Diogo
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