Error adding feature to feature layer

[MichelleGonzalez]

Hello.

I am developing a Silverlight Web Mapping Application, using Visual Studio 2012, ArcGis Silverlight API 3.1 and Rest Services.

I am adding a new feature to a feature layer, called clients. When I add the graphic I get this error: ESRI.ArcGIS.Client.FeatureService.ValidationException: El valor de campo no coincide con los códigos de dominio de valor codificado aceptables.
Translating it to English it says: The value of the filed does not match the domain codes acceptable values.

I am attaching two images with the error.

I would appreciate any help.

Thanks,

Michelle