I would like to change every permission of items that are created by specific user.
When making the WF with the query:
<List ID="..." />
<FieldRef Name="ID" />
<FieldRef Name="Author" LookupId="TRUE" />
I get empty string.
What could be the problem?
If you want to make search by user (display) name you have to configure LookupId="FALSE".
But note search by user display name need not be unique.
To make it working with LookupId="TRUE" you have to supply user ID in place of USERNAME value