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Cannot remove node after aspect property change

Question asked by goldfiled on Feb 2, 2010
I define my own model, which has an aspect and its property is String, then I create content use this type,
after that I change the model file, the property type from String to List, then I can't remove node !!
the log is:
org.alfresco.service.cmr.repository.datatype.TypeConversionException: There is no conversion registered for the value:
value class: java.util.ArrayList
to class: java.lang.String
value: [AI, AIB]
at org.alfresco.service.cmr.repository.datatype.TypeConverter.convert(
at org.alfresco.repo.webservice.Utils.createNamedValue(

How can I remove the node without modifying that model file?
I use Alfresco version: 3.2 community

Thanks in advance.
(sorry post second time, but i found this board is more suitable)