I'm using a Visual Studio SharePoint Solution to create my list instances manually and want to define the UserSelectionScope for a field in a list like this (in the Schema.xml file):
<Field DisplayName="Manager" UserSelectionScope="<MyGroupId>" Type="User" UserSelectionMode="PeopleOnly" Name="Manager" .../>
The Managers group is created using PowerShell and this is of course done after the Site has been created.
Problem: The value for the UserSelectionScope cannot be changed after the Site is created. And before creating site and the group, I don't know what group ID to specify. The New-SPGroup command also does not allow giving a custom group ID as a parameter. How do I get around this?