Hi

I'm looking to delete a great deal of data and a PropertyType on a document type, but I need help.

The case: I have a document type with the alias "user". It has a property of the property type "noderelations" which is a derivation of the "ultimate picker" propertytype. I have a lot of documents with of "user" document types with a lot of "noderelations" on each. At a certain point I would like to delete all this data and alter the "source node" of the "noderelations" property type. I figured the easiest way would be to delete the PropertyType and thereby dumping all data using it, and then create a new "noderelations" with another "source node" for it.

But I get a System.NullReferenceException on an object when I get to the pt.delete() method. 

Can anyone tell me the way to do it or perhaps show me another way of accomplishing the above case problem?

The Code:

PropertyType pt = new PropertyType(DocumentType.GetByAlias("user").getPropertyType("noderelations").Id);
pt.delete();

Thanks a lot!