The rule AA0242 is giving a false positive for such example:

                   // Get next Line No.

                   ServiceLine2.Reset();

                   ServiceLine2.SetRange("Document Type", ServiceLine."Document Type");

                   ServiceLine2.SetRange("Document No.", ServiceLine."Document No.");

                   ServiceLine2.SetLoadFields("Line No.");

                   if ServiceLine2.FindLast() then

                       LineNo := ServiceLine2."Line No." + 10000

                   else

                       LineNo := 10000;

                   // Insert new Line

                   ServiceLine2.Reset(); // Note: this resets SetLoadFields to all fields (according to documentation of "Reset")

                   ServiceLine2.Init();

                   ServiceLine2."Document Type" := ServiceLine."Document Type";

                   ServiceLine2."Document No." := ServiceLine."Document No.";

                   ServiceLine2."Line No." := LineNo;

                   ServiceLine2.Validate("Service Item Line No.", ServiceLine."Service Item Line No.");

warning AA0242: Field 'Service Item Line No.' is not selected for loading and accessing it may cause a JIT load.