diff --git a/AyaNovaQBI/Form1.Designer.cs b/AyaNovaQBI/Form1.Designer.cs
index 1cb7a00..6d87857 100644
--- a/AyaNovaQBI/Form1.Designer.cs
+++ b/AyaNovaQBI/Form1.Designer.cs
@@ -56,7 +56,7 @@
             this.wonumber = new System.Windows.Forms.DataGridViewTextBoxColumn();
             this.servicedate = new System.Windows.Forms.DataGridViewTextBoxColumn();
             this.project = new System.Windows.Forms.DataGridViewTextBoxColumn();
-            this.linked = new System.Windows.Forms.DataGridViewTextBoxColumn();
+            this.linked = new System.Windows.Forms.DataGridViewCheckBoxColumn();
             this.menuStrip1.SuspendLayout();
             ((System.ComponentModel.ISupportInitialize)(this.grid)).BeginInit();
             this.SuspendLayout();
@@ -228,6 +228,7 @@
             this.grid.SelectionMode = System.Windows.Forms.DataGridViewSelectionMode.FullRowSelect;
             this.grid.Size = new System.Drawing.Size(765, 359);
             this.grid.TabIndex = 3;
+            this.grid.CellFormatting += new System.Windows.Forms.DataGridViewCellFormattingEventHandler(this.grid_CellFormatting);
             // 
             // status
             // 
@@ -291,6 +292,8 @@
             this.linked.HeaderText = "Linked";
             this.linked.Name = "linked";
             this.linked.ReadOnly = true;
+            this.linked.Resizable = System.Windows.Forms.DataGridViewTriState.True;
+            this.linked.SortMode = System.Windows.Forms.DataGridViewColumnSortMode.Automatic;
             this.linked.Visible = false;
             this.linked.Width = 64;
             // 
@@ -345,7 +348,7 @@
         private System.Windows.Forms.DataGridViewTextBoxColumn wonumber;
         private System.Windows.Forms.DataGridViewTextBoxColumn servicedate;
         private System.Windows.Forms.DataGridViewTextBoxColumn project;
-        private System.Windows.Forms.DataGridViewTextBoxColumn linked;
+        private System.Windows.Forms.DataGridViewCheckBoxColumn linked;
     }
 }
 
diff --git a/AyaNovaQBI/Form1.cs b/AyaNovaQBI/Form1.cs
index dab3a2f..4610d53 100644
--- a/AyaNovaQBI/Form1.cs
+++ b/AyaNovaQBI/Form1.cs
@@ -23,5 +23,24 @@ namespace AyaNovaQBI
             cbCustomersWithInvoiceableWorkorders.DisplayMember = "Name";
             grid.DataSource = util.GetInvoiceableItems();
         }
+
+        private void grid_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
+        {
+            if (e.ColumnIndex == grid.Columns["Status"].Index
+            && e.Value != null)
+            {
+                var isLinked = (bool)grid.Rows[e.RowIndex].Cells["linked"].Value;
+
+                if (!isLinked)
+                {
+                    grid.Rows[e.RowIndex].Cells["wonumber"].ErrorText = "Not invoiceable: use \"Invoice\" -> \"Fix problems\" to resolve";
+                }else
+                {
+                    grid.Rows[e.RowIndex].Cells["wonumber"].ErrorText = null;
+                }
+
+            }
+
+        }
     }
 }
diff --git a/AyaNovaQBI/util.cs b/AyaNovaQBI/util.cs
index 4f210a0..b9bea8b 100644
--- a/AyaNovaQBI/util.cs
+++ b/AyaNovaQBI/util.cs
@@ -11,9 +11,10 @@ namespace AyaNovaQBI
 
         public static List<InvoiceableItem> GetInvoiceableItems()
         {
+            var random = new Random();
             var l = new List<InvoiceableItem>();
             for (int i = 0; i < 10; i++)
-                l.Add(new InvoiceableItem { CustomerId = 1, Linked = true, Project = "project blah", ServiceDate = DateTime.Now.ToString("s"), ServiceNumber = "44", Status = "Waiting to be invoiced and just sitting there otherwise", StatusColor = "FF00FFAA", WorkorderId = 4 });
+                l.Add(new InvoiceableItem { CustomerId = 1, Linked = random.Next(2) == 1, Project = "project blah", ServiceDate = DateTime.Now.ToString("s"), ServiceNumber = (40+i).ToString(), Status = "Waiting to be invoiced and just sitting there otherwise", StatusColor = "FF00FFAA", WorkorderId = 4 });
 
             return l;
         }