diff --git a/PROMS/Volian.Controls.Library/DisplayTags.cs b/PROMS/Volian.Controls.Library/DisplayTags.cs
index 8681c5e9..00fc25bd 100644
--- a/PROMS/Volian.Controls.Library/DisplayTags.cs
+++ b/PROMS/Volian.Controls.Library/DisplayTags.cs
@@ -497,6 +497,12 @@ namespace Volian.Controls.Library
 		private void listBoxStepTypes_SelectedIndexChanged(object sender, EventArgs e)
 		{
 			if (_Initalizing) return;
+			// B2017-166 Verify before making step type change
+			if (MessageBox.Show("Change Step Type?", "Verify Step Type Change", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
+			{
+				TagsFillIn();
+				return;
+			}
 			EditItem topEditItem = MyEditItem;
 			MyEditItem.SaveContents();
 			FormatData fmtdata = CurItemInfo.ActiveFormat.PlantFormat.FormatData;