fixed Enter Key logic so that it jumps to an RNO only if the substep type has sequential numbering

PROMS/Volian.Controls.Library/StepTabRibbon.cs

@@ -1683,7 +1683,7 @@ namespace Volian.Controls.Library
 				}
 				//else if (deletedRNO || MyItemInfo.IsEquipmentList)
 				//    InsertSiblingBeforeOrAfter("after");
-				else if (MyItemInfo.IsEquipmentList)
+				else if (!MyItemInfo.IsSequential) // only add a sibling if substep type does not have sequential tabs
 					InsertSiblingBeforeOrAfter("after");
 				else if (deletedRNO)
 				{