Csla 3.8->4.5 Migration and SingleCriteria

Hello

I'm upgrading some big Csla projects from 3.8 to 4.5. I'm also testing the new MobileProxy portal for 3-layer deployment.

 I've found that those projects use the SingleCriteria as the fetch parameter, where the parameter is another BusinessObject as a Filter, something like:   SingleCriteria<CustomerList, CustomerFilter>

When using this SingleCriteria parameter with a MobileProxy dataportal it fails with a "Serialization of type object is not supported" (it works OK with LocalPortal). I though it failed because the value property of SingleCriteria is not a managed property, however it still fails after changing to a managed property.

I know SingleCriteria is deprecated and that I can pass the CustomerFilter directly without the SingleCriteria, but I'd like to ask if I anyone know how can I modify this class temporaly so it works ok with serialization so I don't have to change the code when migrating to 4.5

Thank you
Jacobo