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Based on the way numerical fields and calculation fields work one option (if you want to remain with formfields) is to use formatted numerical fields for your variables using the following numerical format and leave the defualt numbe field blank:
and use a plain text field (with fill in enabled unchecked) for the result. You would need to assign the following macro to run on exit from your variable field.
Dim lngA As Long, lngB As Long, lngResult As Long
On Error Resume Next
lngA = CLng(ActiveDocument.FormFields("Text1").Result)
If Err.Number <> 0 Then lngA = 0
lngB = CLng(ActiveDocument.FormFields("Text2").Result)
If Err.Number <> 0 Then lngB = 0
On Error GoTo 0
lngResult = lngA + lngB
ActiveDocument.FormFields("Text3").Result = FormatCurrency(lngResult)
If ActiveDocument.FormFields("Text1").Result = "" Then
ActiveDocument.FormFields("Text2").Result = ""
ActiveDocument.FormFields("Text3").Result = ""
As an alternative you could leave the form as it is and offer you users to the option to clear all fields including the zeros before printing using this procedure:
Dim oFF As FormField
For Each oFF In ActiveDocument.FormFields
oFF.Result = ""
For help installing and using this macro see: http://www.gmayor.com/installing_macro.htm