Does anyone know why Excel can't set the orientation of a
data field when after several row fields have been set? I
am getting an error:

--------------------------------
Run-time error '1004':

Unable to set the Orientation property of the PivotField
class
--------------------------------

when I do the following.
========================
ActiveSheet.PivotTables("PivotTable1").AddFields
RowFields:=Array( _
"AcctSt", "AcctCity", "Account", "Class", "Item", "
Data")

With ActiveSheet.PivotTables("PivotTable1").PivotFields
("Units Available")
.Orientation = xlDataField
.Position = 1
End With
ActiveSheet.PivotTables("PivotTable1").PivotFields
("Units To Ship").Orientation = xlDataField
========================

The last statement gives the error. I reduce the number
of fields that the first statement sets and it works.
Then I have to set the RowFields later.

I don't see any limits on the Help Screen about the
AddFields. Any suggestions?