JPA composite primary key with null value

I have a table containing customer data in an oracle database. Here is a simplified definition:

CUSTOMER (CUSTOMER_ID NUMBER NOT NULL,
          SOURCE_SYSTEM VARCHAR2(30),
          FULL_NAME VARCHAR2(360),
          PHONE_NUMBER VARCHAR2(240)
          )

The primary key for this table is (CUSTOMER_ID, SOURCE_SYSTEM).

The table has numerous rows for which SOURCE_SYSTEM is null. At the database level, there is no issue, however when I try to access any of these rows via JPA Entity, it causes a number of issues:

1: Using em.find() to fetch a row with a null SOURCE_SYSTEM always results in a null being returned.

2: Using em.merge() to upsert a row with a null SOURCE_SYSTEM succeeds if the record does not exist in the table, but fails on subsequent updates because the merge ALWAYS results in an insert being run.

3: Using em.createQuery() to explicitly query for a row with a null causes the following exception:

Exception [EclipseLink-6044] (Eclipse Persistence Services - 2.3.1.v20111018-r10243):
   org.eclipse.persistence.exceptions.QueryException
Exception Description: The primary key read from the row [ArrayRecord(
CUSTOMER.CUSTOMER_ID => 1
CUSTOMER.FULL_NAME => GUY PERSON
CUSTOMER.PHONE_NUMBER => 555-555-1234
CUSTOMER.SOURCE_SYSTEM => null)] during the execution of the query was detected to be null.
   Primary keys must not contain null.
Query: ReadAllQuery(referenceClass=Customer sql="SELECT CUSTOMER_ID, FULL_NAME, PHONE_NUMBER, SOURCE_SYSTEM FROM CUSTOMER WHERE ((CUSTOMER_ID = ?) AND (SOURCE_SYSTEM IS NULL))")

Unfortunately, "Primary keys must not contain null" seems pretty final. I was unable to find too much information on workarounds for this error, which makes it seem like there is no solution.

THE QUESTION: I would like to know if anyone has any Java code-based solution that don't involve making changes to the database. My current workaround is to use ROW_ID as the @Id of the table, but this means I can no longer use em.merge() or em.find().

Here are my Java classes:

Customer.java:

@Entity
@Table(name = "CUSTOMER")
public class Customer implements Serializable {
  private static final long serialVersionUID = 1L;

  @EmbeddedId
  private Customer_Id key;

  @Column(name = "CUSTOMER_ID", nullable = false, insertable = false, updatable = false)
  private Long customerId;
  @Column(name = "SOURCE_SYSTEM", length = 30, insertable = false, updatable = false)
  private String sourceSystem;

  @Column(name = "FULL_NAME", length = 360)
  private String fullName;
  @Column(name = "PHONE_NUMBER", length = 240)
  private String phoneNumber;

  //Setters, Getters, etc
  ...
}

Customer_Id.java

@Embeddable
public class Customer_Id implements Serializable {
  private static final long serialVersionUID = 1L;

  @Column(name = "CUSTOMER_ID", nullable = false)
  private Long customerId;
  @Column(name = "SOURCE_SYSTEM", length = 30)
  private String sourceSystem;

  //Setters, Getters, etc
  ...
}

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