New Post: Relationship with non-primary column

I have two tables:

create table dbo.Period
(
    [Year]  smallint      not null,
    [Month] tinyint       not null,
    Tariff  decimal(9, 5) not null,
    Id      smallint      not null,
    constraint PK_Period_Year_Month primary key ([Year], [Month]),
    constraint UQ_Period_Id unique (Id)
);
create table dbo.Act
(
    PeriodId      smallint     not null,
    Id            int identity not null,
    Number        varchar(20)  not null,
    constraint PK_Act_Number primary key (PeriodId, Id),
    constraint FK_Act_PeriodId@Period_Id foreign key (PeriodId) references Period(Id)
);

As you see, the Period.Id is not a primary key and it is migrated as a foreign key to Act.PeriodId (which itself is a part of primary key).
Here's question: Is it possible to express this relationship in Code First?
I have found several same questions on stackoverflow, and all answers were "current version of Code First doesn't allow such relationship". I wonder does the greatest-and-latest version of Code First allow it?