This policy setting allows you to specify the default limit of how much data in kilobytes (KB) the web service shim can return ...

This policy setting allows you to specify the default limit of how much data in kilobytes (KB) the web service shim can return per call. The application is allowed to specify a larger limit programmatically.If you enable this policy setting, you may specify the default limit of data in kilobytes the web service shim can return per call.If you disable or do not configure this policy setting, a default limit of 3000 KB will be used.