Remove Unused usings - Problem with CalcFormula

[pri-kise]

The action Remove unused usings removes to much usings.

We have the following FlowField in a TableExtension:

        field(50000; "PTE Created by"; Code[80])
        {
            Access = Public;
            CalcFormula = lookup(User."Full Name" where("User Security ID" = field(SystemCreatedBy)));
            Caption = 'Created by';
            Editable = false;
            FieldClass = FlowField;
            ToolTip = 'User who created this record.';
        }

The code action remove the using using System.Security.AccessControl;.

I guess that CalcFormula isn't checked yet.