Entity Framework, configuration for reading and writing - entity-framework

Question

Given the following database model
I have two fluent entity framework configurations, one that works when I read (the setupFields list is set) and the other for writing, which if I use for reading as well, always comes with an empty SetupFields list
[Table("[BALANCE.SETUP]")]
public class SetupEntity
{
[Key]
public Guid Id { get; set; }
public string Title { get; set; }
public virtual ChassisEntity Chassis { get; set; }
public virtual EventEntity Event { get; set; }
public virtual ICollection<SetupFieldEntity> SetupFields { get; set; }
}
[Table("[BALANCE.SETUP.FIELD]")]
public class SetupFieldEntity
{
[Key]
[Column(Order = 0)]
public Guid SetupId { get; set; }
[Key]
[Column(Order = 1)]
public int Sequence { get; set; }
public string Section { get; set; }
public string Name { get; set; }
public string Value { get; set; }
public virtual SetupEntity Setup { get; set; }
}
(can read)
modelBuilder.Entity<SetupEntity>()
.HasMany(x => x.SetupFields)
.WithRequired(x => x.Setup)
.Map(x => x.MapKey("SETUPID"));
(can write)
modelBuilder.Entity<SetupEntity>()
.HasMany(x => x.SetupFields)
.WithRequired()
.HasForeignKey(x => x.SetupId);
If I use the read configuration to read, this is the error I get:
The column name 'SETUPID' is specified more than once in the SET clause. A column cannot be assigned more than one value in the same SET clause. Modify the SET clause to make sure that a column is updated only once. If the SET clause updates columns of a view, then the column name 'SETUPID' may appear twice in the view definition.
UPDATE 1
Just to make things clear, the models are lazy loaded and I'm explicitly inclucing them, so, when using the first connfiguration the models are set as expected:
if (includeFields)
{
x = x.Include(entity => entity.SetupFields);
}
UPDATE 2
Based on the comments bellow I change the mappings to have just this which works when inserting but when reading the child collection is still null:
modelBuilder.Entity<SetupEntity>().HasMany(x => x.SetupFields);
[Table("[BALANCE.SETUP]")]
public class SetupEntity
{
[Key]
public Guid Id { get; set; }
public string Title { get; set; }
public virtual ChassisEntity Chassis { get; set; }
public virtual EventEntity Event { get; set; }
public virtual ICollection<SetupFieldEntity> SetupFields { get; set; }
}
[Table("[BALANCE.SETUP.FIELD]")]
public class SetupFieldEntity
{
[Key]
[Column(Order = 0)]
public Guid SetupId { get; set; }
[Key]
[Column(Order = 1)]
public int Sequence { get; set; }
public string Section { get; set; }
public string Name { get; set; }
public string Value { get; set; }
public virtual SetupEntity Setup { get; set; }
}
UPDATE 3
Based on the comments I completelly removed the attributes from the entities, but the collection property is still null :(
public class SetupEntity
{
public Guid Id { get; set; }
public string Title { get; set; }
public virtual ChassisEntity Chassis { get; set; }
public virtual EventEntity Event { get; set; }
public virtual ICollection<SetupFieldEntity> SetupFields { get; set; }
}
[Table("[BALANCE.SETUP.FIELD]")]
public class SetupFieldEntity
{
public Guid SetupId { get; set; }
public int Sequence { get; set; }
public string Section { get; set; }
public string Name { get; set; }
public string Value { get; set; }
public virtual SetupEntity Setup { get; set; }
}
modelBuilder.Entity<SetupEntity>()
.HasKey(x => x.Id)
.HasMany(x => x.SetupFields)
.WithRequired(x => x.Setup);
modelBuilder.Entity<SetupFieldEntity>()
.HasKey(x => x.SetupId)
.HasKey(x => x.Sequence);