diff --git a/ClosedXML/Excel/PivotTables/PivotValues/XLPivotValues.cs b/ClosedXML/Excel/PivotTables/PivotValues/XLPivotValues.cs
index e5e124d..ef16caf 100644
--- a/ClosedXML/Excel/PivotTables/PivotValues/XLPivotValues.cs
+++ b/ClosedXML/Excel/PivotTables/PivotValues/XLPivotValues.cs
@@ -32,7 +32,7 @@
         }
         public IXLPivotValue Add(String sourceName, String customName)
         {
-            if (!this._pivotTable.SourceRangeFieldsAvailable.Contains(sourceName, StringComparer.OrdinalIgnoreCase))
+            if (sourceName != XLConstants.PivotTableValuesSentinalLabel && !this._pivotTable.SourceRangeFieldsAvailable.Contains(sourceName, StringComparer.OrdinalIgnoreCase))
                 throw new ArgumentOutOfRangeException(nameof(sourceName), String.Format("The column '{0}' does not appear in the source range.", sourceName));
 
             var pivotValue = new XLPivotValue(sourceName) { CustomName = customName };
diff --git a/ClosedXML/Excel/PivotTables/XLPivotFields.cs b/ClosedXML/Excel/PivotTables/XLPivotFields.cs
index 42abd9d..d35e0e8 100644
--- a/ClosedXML/Excel/PivotTables/XLPivotFields.cs
+++ b/ClosedXML/Excel/PivotTables/XLPivotFields.cs
@@ -22,7 +22,7 @@
 
         public IXLPivotField Add(String sourceName, String customName)
         {
-            if (!this._pivotTable.SourceRangeFieldsAvailable.Contains(sourceName, StringComparer.OrdinalIgnoreCase))
+            if (sourceName != XLConstants.PivotTableValuesSentinalLabel && !this._pivotTable.SourceRangeFieldsAvailable.Contains(sourceName, StringComparer.OrdinalIgnoreCase))
                 throw new ArgumentOutOfRangeException(nameof(sourceName), String.Format("The column '{0}' does not appear in the source range.", sourceName));
 
             var pivotField = new XLPivotField(sourceName) { CustomName = customName };