Not able to create sub folder using SharePoint web service in large SharePoint document library (Item count view threshold limit)

Question

We are trying to create folder & subfolder in a SharePoint document library using SharePoint default(dws) web service. Document library has unique permission as well as item level permission. It was working as expected. Once item count crosses
view threshold limit ( 5000) , create folder web method completes with an error and it creates a folder in SharePoint.
Request:
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:dws="http://schemas.microsoft.com/sharepoint/soap/dws/">
   <soapenv:Header/>
   <soapenv:Body>
      <dws:CreateFolder>
         <!--Optional:-->
         <dws:url>Shared Documents/VenTest02092015v1</dws:url>
      </dws:CreateFolder>
   </soapenv:Body>
</soapenv:Envelope>
 Response:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <soap:Body>
      <CreateFolderResponse xmlns="http://schemas.microsoft.com/sharepoint/soap/dws/">
         <CreateFolderResult>&lt;Error ID="2">Failed&lt;/Error></CreateFolderResult>
      </CreateFolderResponse>
   </soap:Body>
</soap:Envelope>
 While trying to create subfolder under the above created folder service throws an exception saying
FolderNotFound.
Though we are able to create subfolder from SharePoint UI successfully. 
Request
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:dws="http://schemas.microsoft.com/sharepoint/soap/dws/">
   <soapenv:Header/>
   <soapenv:Body>
      <dws:CreateFolder>
         <!--Optional:-->
         <dws:url>Shared Documents/VenTest02092015v1/REQ-1</dws:url>
      </dws:CreateFolder>
   </soapenv:Body>
</soapenv:Envelope>
Response:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <soap:Body>
      <CreateFolderResponse xmlns="http://schemas.microsoft.com/sharepoint/soap/dws/">
         <CreateFolderResult>&lt;Error ID="10">FolderNotFound&lt;/Error></CreateFolderResult>
      </CreateFolderResponse>
   </soap:Body>
</soap:Envelope>

Answer 1

Yes, you're probably hitting the 5000 list item threshold (
http://sharepoint.stackexchange.com/questions/105937/overcoming-5000-file-document-library-limits ). I assume you can do it via the UI because you're probably logged in as an admin in which case, out of memory, the threshold is 20.000 items. You can extend
this limit, but you probably shouldn't.
Kind regards,
Margriet Bruggeman
Lois & Clark IT Services
web site: http://www.loisandclark.eu
blog: http://www.sharepointdragons.com