I have a list in the destination site collection. when I change am item, I have to copy a file from a different farm into a document library which is on the same site collection where the list is, so In my web service action, COPY.asmx is from the source site but workflow in running on the destination site collection.
I am getting <CopyResult ErrorCode="Unknown" ErrorMessage="Object reference not set to an instance of an object." DestinationUrl="http://destination_site_col/Shared%20Documents/myfile.pdf" />
</Results>
</CopyIntoItemsLocalResponse>
If I change the authentication and use my own login, I get
<CopyResult ErrorCode="DestinationInvalid" ErrorMessage="Cannot create an item at the requested destination. Verify that the folder exists and that you have permission to edit in it." DestinationUrl="http://destination_site_col/Shared%20Documents/myfile.pdf" />
</Results>
</CopyIntoItemsLocalResponse>