Update state of a resource

Hi KM Experts,

I would like to update the status of a KM Resource, currently approval flow is activeted un the directory containing the resource and the status is "to be released".

The following code should put the ressource state back to "in progress" but it doesn't ... what is missing ?

IResource myResource = ...

IPropertyName propName = (IPropertyName) new PropertyName("http://sapportals.com/xmlns/cm", "state");

IProperty prop = myResource.getProperty(propName);

IMutableProperty mutableProp = prop.getMutable();

mutableProp.setStringValue("in progress");

Thanks in advance

Laurent B.