c# - Create one to many association without foreign key -

giving following tables.

project id: int not null pk type: nvarchar(10) not null  someproperty: nvarchar(50)  changerequest id: int not null pk type: nvarchar(10) not nul someproperty: nvarchar(50)  approval id: int not null pk rowid: int not null rowtype: nvarchar(10) not null someproperty: nvarchar(50) 

i want have associations this:

• project(id, type) -> approval(rowid, rowtype)
• changerequest(id, type) -> approval(rowid, rowtype)

in way if selecting data database like:

select p*, a.* project p left join approval on a.rowid = p.id , a.rowtype = p.type 

project , changerequest entities different (i put simplified model), both may have 0..n approvals.

is possible map such relations using entity framework?