Fixed bug

Diligent.WebAPI.Business/Services/Interfaces/ISelectionLevelService.cs

     public interface ISelectionLevelService
     {
         Task<List<SelectionLevelResponseWithDataDto>> GetAllAsync();
-        Task<SelectionProcessResposneDto> GetByIdAsync(int id);
+        Task<SelectionLevelResposneDto> GetByIdAsync(int id);
     }
 }

Diligent.WebAPI.Business/Services/SelectionLevelService.cs

         public async Task<List<SelectionLevelResponseWithDataDto>> GetAllAsync() =>
             _mapper.Map<List<SelectionLevelResponseWithDataDto>>(await _context.SelectionLevels.Include(sl => sl.SelectionProcesses).ToListAsync());
 
-        public async Task<SelectionProcessResposneDto> GetByIdAsync(int id)
+        public async Task<SelectionLevelResposneDto> GetByIdAsync(int id)
         {
             var sl = await _context.SelectionLevels.FindAsync(id);
 
             if (sl is null)
                 throw new EntityNotFoundException("Selection level not found");
 
-            return _mapper.Map<SelectionProcessResposneDto>(sl);
+            return _mapper.Map<SelectionLevelResposneDto>(sl);
 
         }
     }

Diligent.WebAPI.Contracts/DTOs/SelectionLevel/SelectionLevelResponseWithDataDto.cs

 {
     public class SelectionLevelResponseWithDataDto
     {
-        public int LevelId { get; set; }
-
+        public int Id { get; set; }
         public string Name { get; set; }
         public SelectionProcessResposneDto SelectionProcesses { get; set; }
     } 

Diligent.WebAPI.Contracts/DTOs/SelectionLevel/SelectionLevelResposneDto.cs

 {
     public class SelectionLevelResposneDto
     {
-        public int LevelId { get; set; }
+        public int Id { get; set; }
 
         public string Name { get; set; }
     }

Diligent.WebAPI.Contracts/DTOs/SelectionProcess/SelectionProcessResposneDto.cs

         public string Status { get; set; }
         public DateTime? Date { get; set; }
         public string? Link { get; set; }
-        public ApplicantViewDto Applicant { get; set; }
+        //public ApplicantViewDto Applicant { get; set; }
     }
 }

Diligent.WebAPI.Data/Entities/SelectionProcess.cs

         public int SelectionLevelId { get; set; }
         public SelectionLevel SelectionLevel { get; set; }
         public int ApplicantId { get; set; }
+        public Applicant Applicant { get; set; }
     }
 }