files tree made better.

src/Yavsc.Abstract/Billing/ICommandLine.cs

@@ -0,0 +1,13 @@
+
+namespace Yavsc.Billing
+{
+
+    public interface ICommandLine : IBillItem
+    {
+        // FIXME too hard: no such generic name in any interface
+         long Id { get; set; }
+
+        // FIXME too far: perhaps no existing estimate
+         long EstimateId { get; set; }
+    }
+}