expression.SetAllErrorFlags(Invalid, InvalidComment)
expression Required. An expression that returns a MailMergeDataSource object.
Invalid Required Boolean. True marks all records in the data source of a mail merge as invalid.
InvalidComment Required String. Text describing the invalid setting.
Remarks
You can individually mark data source records that contain invalid data in an address field by using the InvalidAddress and InvalidComments properties.
Example
This example marks all records in the data source as containing an invalid address field, sets a comment as to why it is invalid, and excludes all records from the mail merge.
Sub FlagAllRecords()
With ActiveDocument.MailMerge.DataSource
.SetAllErrorFlags Invalid:=True, InvalidComment:= _
"All records in the data source have only 5-" _
& "digit zip codes. Need 5+4 digit zip codes."
.SetAllIncludedFlags Included:=False
End With
End Sub