Relationships without "key fields" failing...

[DynConcepts]

[Not sure what the proper terminology is]

`using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using InterfacesAndModels.WorkTracking;
namespace EntityPersistance.WorkTracking;
public class WorkTrackingRepository : IWorkTrackingRepository
{
public WorkTrackingRepository()
{
Name = String.Empty;
}
[Key]
public virtual Guid ID {get; set; }
public virtual string Name {get; set; }
public virtual ICollection Items { get; set; } = new List();
}

public class WorkTrackingItem : IWorkTrackingItem
{
[Key]
public virtual Guid ID {get; set; }
[NotMapped]
IWorkTrackingRepository IWorkTrackingItem.Repository
{
get { return RepositoryEntity; }
set { RepositoryEntity = (WorkTrackingRepository)value; }
}
public virtual required WorkTrackingRepository RepositoryEntity { get; set; }
public virtual int WorkItemNumber { get; set;}
public virtual int CurrentRevisionNumber { get; set;}
[NotMapped]
IEnumerable IWorkTrackingItem.Fields
{
get { return FieldEntities; }
set { FieldEntities = (ICollection)value; }
}
public virtual ICollection FieldEntities { get; set; } = new List();
}

public class WorkTrackingField : IWorkTrackingField
{
[Key]
public virtual Guid ID {get; set; }
public virtual required string Name {get; set; }

public virtual string? PersistedValue { get; set; }
[NotMapped] 
public required object Value {get; set; }

[NotMapped]
IWorkTrackingItem IWorkTrackingField.Item
{
    get { return ItemEntity; }
    set { ItemEntity = (WorkTrackingItem)value; }
}

public virtual required WorkTrackingItem ItemEntity { get; set; }

}
`

Building this and then attempting a BulkSaveChanges, results in an error.. that I have tracked to here...
It is looking for a WorkTrackingFieldID [Guid] field, rather than the actual relationship...

Possible some additional annotation is needed rather than whacking the code?