I'm using Aspose.Words (Rel. 220.127.116.11). When I have a datatable in my dataset with an undescore ("_") in the thable name, the table name is truncated by the MailMergeWithRegions method.
Example : MYTABLE_1 ==> MYTABLE
The call of MailMergeWithRegions on a datatable called MYTABLE_1 produces the exception "InvalidOperationException : Cannot find table 'MYTABLE' in the dataset"