What properties are necessary for copy

Hi,
I've implemented a repositor manager and am testing copy function. Copying documents into my repository manager is OK, but when I try to copy a document from my repository to another EP place like /documents, it always failed with an error message  Cannot assign an empty string to host variable 4. 
I think when copy, the properties and content of the source object will be retrieved. in getProperties() I have the following:
<code>
properties.add(SystemPropertyFactory.createCollectionProperty(false));
properties.add(SystemPropertyFactory.createContentTypeProperty("application/octet-stream"));
properties.add(SystemPropertyFactory.createDisplayNameProperty("mytitle"));
properties.add(SystemPropertyFactory.createReadOnlyProperty(true));
properties.add(SystemPropertyFactory.createContentLengthProperty(888));
</code>
and in getContent() I return BufferedInputStream.
So why there should be empty or null string...
Thanks,
Ray

Hi Gurus,
Please help why there's an error <u>
Cannot assign an empty string to host variable 4
</u> when I wanna copy a document of my repository manager into other documents. In fact, sometimes it works on one EP but fails on another. So where can I see the log for copy?
Thanks,
Ray

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