¿Porque surge este inconveniente al guardar una solicitud de vacaciones?

System.InvalidOperationException: The 'HorasSolicitadas' property on 'SolicitudVacacion' could not be set to a 'Int32' value. You must set this property to a non-null value of type 'Decimal'. at System.Data.Common.Internal.Materialization.Shaper.ErrorHandlingValueReader`1.GetValue(DbDataReader reader, Int32 ordinal) at System.Data.Common.Internal.Materialization.Shaper.GetPropertyValueWithErrorHandling[TProperty](Int32 ordinal, String propertyName, String typeName) at lambda_method(Closure , Shaper ) at System.Data.Common.Internal.Materialization.Shaper.HandleEntityAppendOnly[TEntity](Func`2 constructEntityDelegate, EntityKey entityKey, EntitySet entitySet) at lambda_method(Closure , Shaper ) at System.Data.Common.Internal.Materialization.Coordinator`1.ReadNextElement(Shaper shaper) at System.Data.Common.Internal.Materialization.Shaper`1.SimpleEnumerator.MoveNext() at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source) at Aseinfo.Infrastructure.Base.Entity.EntityServiceBase`2.GetEntityById(IdT id, Expression`1[] includes) in C:\BuildAgent\work\2af027e4cc30ca96\Infrastructure\Base\Entity\EntityServiceBase.cs:line 260 at Aseinfo.VH4.Acciones.Controllers.SolicitudVacacionController.Edit(Int32 id) in c:\BuildAgent\work\2af027e4cc30ca96\VH4\Acciones\Controllers\SolicitudVacacionController.cs:line 327 at lambda_method(Closure , ControllerBase , Object[] ) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)

Es en Evolution version 1.7.1