title: How to use CopyIntoItems to copy files into existing doclib items
body: <p>This is my scenario: I need to copy files to a sharepoint document library using its web services and set metadata on them. That's all possible with CopyIntoItems (from Copy webservice) except for Lookup fields. CopyIntoItems ignores them, so i need another way to set data on those fields.</p>
  
  <p>I've tried to create a list item with the mandatory and lookup fields metadata and then, using the item ID (creating a FieldInformation field with the ID, as well as some other simple metadata), called the CopyIntoItems method and, instead of updating the item, sharepoint created a new one.</p>
  
  <p>I can't do this in the reverse order because i have no way to get the ID from the item created by CopyIntoItems...</p>
  
  <p>So, the question is: How can i upload a file to a sharepoint document library and set all its metadata? Including Lookup fields.</p>