Different EntityTypeConfiguration Mappings for Same Class

I have two entities that use the same class to represent a name:

Participant

class Participant
{
  public PersonName Name { get; set; }
}

Judge

class Judge
{
  public PersonName Name { get; set; }
}

PersonName

class PersonName
{
  public string First { get; set; }
  public string Last { get; set; }
  public string Full { get; set; }
}

In the table for Participant, the Last value is a required (non-null) column. In the table for Judge, only the Full value is used (and optional). My problem is that EF is applying the IsRequired() from my Participant mapping to the Judge instance of PersonName and thus failing when only the Full value is supplied for a Judge Entity.

Participant Mapping

Property(t => t.Name.Last)
  开发者_如何学编程.IsRequired();

Judge Mapping

Property(t => t.Name.Full)
  .HasMaxLength(100);

Entity Validation Error

The Judge.Name.Last field is required.

Is there a way to avoid this mapping collision other than creating separate PersonName-like classes for each mapping situation?

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Why to avoid separate class if your Judge use only part of PersonName values? Judge's Name is a different class.

Storage dependent part of complex type mapping is shared among entities using that type.