Stored Procedure for Update purpose does not affect any rows in entity framework

ALTER proc [dbo].[sp_AmbalajGuncelle]
@ID int,
@adTR nvarchar(250),
@adEN nvarchar(250),
@aktif bit
 
as 
update Ambalajlar 
set Ambalajlar.AmbalajAdiTR = @adTR, Ambalajlar.AmbalajAdiEN = @adEN, Ambalajlar.Aktif = @aktif
where Ambalajlar.ID = @ID

 
I've added the stored procedure in my winform project via function importing. I have also other procedures which have already imported and they are working well. Only the procedure i wrote above does not affect any rows.
 
Here is my imported function provided by entity framework in C# code which also does not throw any exceptions. it seems working well at application side, but doesn't affect any rows at database as i said so.
 

cn.DBConnect.AmbalajGuncelle(Convert.ToInt32(lvAmbalajlar.Tag), txtAmbalajAdiTR.Text, txtAmbalajAdiEN.Text, chkAktif.Checked);
cn.DBConnect.SaveChanges();

 
Thanks for any help.