diff --git a/DigitalData.UserManager.Application/Key.cs b/DigitalData.UserManager.Application/Key.cs
index 38c6090..eec4b67 100644
--- a/DigitalData.UserManager.Application/Key.cs
+++ b/DigitalData.UserManager.Application/Key.cs
@@ -8,5 +8,7 @@
         public static readonly string UserAlreadyExists = "UserAlreadyExists";
         public static readonly string UserNotFound = "UserNotFound";
         public static readonly string UnauthorizedUser = "UnauthorizedUser";
+        public static readonly string DateRangeNotXNOR = "DateRangeNotXNOR";
+        public static readonly string InvalidDateRange = "InvalidDateRange";
     }
-}
+}
\ No newline at end of file
diff --git a/DigitalData.UserManager.Application/Services/UserRepService.cs b/DigitalData.UserManager.Application/Services/UserRepService.cs
index 2e946ce..348b7c9 100644
--- a/DigitalData.UserManager.Application/Services/UserRepService.cs
+++ b/DigitalData.UserManager.Application/Services/UserRepService.cs
@@ -5,13 +5,16 @@ using DigitalData.UserManager.Application.DTOs.UserRep;
 using DigitalData.UserManager.Domain.Entities;
 using DigitalData.UserManager.Infrastructure.Contracts;
 using Microsoft.Extensions.Localization;
+using Microsoft.Extensions.Logging;
 
 namespace DigitalData.UserManager.Application.Services
 {
     public class UserRepService : BaseService<IUserRepRepository, UserRepCreateDto, UserRepReadDto, UserRepUpdateDto, UserRep>, IUserRepService
     {
+        private readonly IStringLocalizer<Resource> _localizer;
         public UserRepService(IUserRepRepository repository, IStringLocalizer<Resource> localizer, IMapper mapper) : base(repository, mapper)
         {
+            _localizer = localizer;
         }
 
         public async Task<DataResult<IEnumerable<UserRepReadDto>>> ReadAllAsync(bool withUser = false, bool withRepGroup = false, bool withGroup = false, bool withRepUser = false, int? userId = null, int? groupId = null)
@@ -20,5 +23,15 @@ namespace DigitalData.UserManager.Application.Services
             var urReadDTOs = _mapper.Map<IEnumerable<UserRepReadDto>>(urs);
             return Result.Success(urReadDTOs);
         }
+
+        public override async Task<DataResult<int>> CreateAsync(UserRepCreateDto createDto)
+            // XOR control
+            => (createDto.ValidFrom is null && createDto.ValidTo is not null) || (createDto.ValidFrom is not null && createDto.ValidTo is null)
+                ? Result.Fail<int>().Notice(LogLevel.None, Flag.DataIntegrityIssue, _localizer[Key.DateRangeNotXNOR])
+            //date range control
+                : (createDto.ValidFrom > createDto.ValidTo)
+                ? Result.Fail<int>().Notice(LogLevel.None, Flag.DataIntegrityIssue, _localizer[Key.InvalidDateRange])
+                : await base.CreateAsync(createDto);
+        
     }
 }
\ No newline at end of file