Get @OneToMany mapping in JPA for only one of two @Ids of mapped entity

Question

I have two JPA entities. In fact both are in the same table, but I think it doesn't matter for now.

There is ProductLine and ProductLineVersion. In ProductLine there are many ProductLineVersions. This relation is unidirectional (no ProductLine in ProductLineVersion).

ProductLineVersion has two Ids: PRODUCT_LINE_ID and PRODUCT_LINE_VERSION_NO. Because there can be many versions for each productLine.

Table looks like this:

PRODUCT_LINE_ID | PRODUCT_NAME | PRODUCT_LINE_VERSION_NO | other product columns
----------------|--------------|-------------------------|----------------------
MOTOR           | MOTOR        | 1                       | other data
MOTOR           | MOTOR        | 2                       | other data
CAR             | CAR          | 1                       | other data

So both entities are mapped to the same table.

In ProductLine I tried to map it like this:

@OneToMany
@JoinColumn(name = "PRODUCT_LINE_ID", referencedColumnName = "PRODUCT_LINE_ID")
private List<ProductLineVersion> productLineVersions;

I think this mapping makes sense. In ProductLine with specific Id, I want to have all ProductLineVersions which have the same PRODUCT_LINE_ID. Yet compiler complains:

Exception Description: The @JoinColumns on the annotated element [field productLineVersions] from the entity class [class pl.ncdc.tia.soa.entity.ProductLine] is incomplete. When the source entity class uses a composite primary key, a @JoinColumn must be specified for each join column using the @JoinColumns. Both the name and the referencedColumnName elements must be specified in each such @JoinColumn.

I don't understand why can't I map it using only one key. It works when I remove @Id annotation from PRODUCT_LINE_VER_NO, but I need this annotation there, because versions with different numbers are logically different entities.