diff --git a/PROMS/Volian.Controls.Library/StepTabRibbon.cs b/PROMS/Volian.Controls.Library/StepTabRibbon.cs
index 2bbbb853..d730a452 100644
--- a/PROMS/Volian.Controls.Library/StepTabRibbon.cs
+++ b/PROMS/Volian.Controls.Library/StepTabRibbon.cs
@@ -2751,6 +2751,12 @@ namespace Volian.Controls.Library
 			}
 			else if (MyItemInfo.IsRNOPart)
 			{
+				// B2013-154: if in single column mode, enter key from an RNO part should insert an RNO part:
+				if (MyItemInfo.ColumnMode == 0)
+				{
+					CreateNewRNO();
+					return;
+				}
 				MyStepRTB.StepRTB_ArrowPressed(E_ArrowKeys.CtrlLeft);
 				if (MyItemInfo.IsHigh)
 				{