Sitecore maximum size for uploading files based on file type and UserRoles using UploadProcessor
08/11/2013
Web.config your UploadRestriction item
Tag: Valuelookup
MaxItems lookup setting that controls the number of items in Lookup, Multilist and Valuelookup fields.
17/06/2013
You have probably run into that your lookup field does not show over 100 items and the magic is in web.config and you can change to a higher value as desired!
Mortaza Kamal Nourestani, Sitecore, Umbraco, .NET, ASP.NET and Web Application 