Error en Modificación de Esquema Salarial (Evolution v.1.9.0.0)

Al intentar crear una nueva modificación de esquema salarial, se produce la siguiente excepción :

System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary. at Aseinfo.VH4.Acciones.Controllers.IncrementoController.<asignadatosparadropdownlists>b23(ValueListItem x) in c:BuildAgentwork89066541112bb801VH4AccionesControllersIncrementoController.cs:line 762 at System.Linq.Enumerable.ToDictionaryTSource,TKey,TElement at Aseinfo.VH4.Acciones.Controllers.IncrementoController.AsignaDatosParaDropDownLists(Int32 codigoGrupo, Nullable1 codigoTipoIncremento) in c:BuildAgentwork89066541112bb801VH4AccionesControllersIncrementoController.cs:line 762 at Aseinfo.VH4.Acciones.Controllers.IncrementoController.Create() in c:BuildAgentwork89066541112bb801VH4AccionesControllersIncrementoController.cs:line 358 at lambda_method(Closure , ControllerBase , Object[] ) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary2 parameters) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<begininvokesynchronousactionmethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult2.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<invokeactionmethodfilterasynchronouslyrecursive>b3d() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>cDisplayClass46.<invokeactionmethodfilterasynchronouslyrecursive>b3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>cDisplayClass46.<invokeactionmethodfilterasynchronouslyrecursive>b3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>cDisplayClass46.<invokeactionmethodfilterasynchronouslyrecursive>b3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>cDisplayClass46.<invokeactionmethodfilterasynchronouslyrecursive>b3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>cDisplayClass46.<invokeactionmethodfilterasynchronouslyrecursive>b3f() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>cDisplayClass33.<begininvokeactionmethodwithfilters>b32(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>cDisplayClass21.<>cDisplayClass2b.<begininvokeaction>b1c() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>cDisplayClass21.<begininvokeaction>b__1e(IAsyncResult asyncResult)