The problem seemed be caused by a new setting introduced by GP2013.
Investigation indicates this is due to record missing in table SY04904 (I believe this is new to version GP2013?).
I notice a record like below need to be created for the statement go out as PDF. Any customer missing a record as below in this table seem to send statement as TXT format attachment.
I also notice that by getting to the ‘Customer Email Option Window’ via Debtor Maintenance Window, ‘Email’ button, even I made no selection , as long as I get in the window, a record in table SY0494 similar to above mentioned for selected customer got created.
Our solution is to insert records according to data in RM00106 excluding what is already exist in SY04904.
Tested resending statement after inserting the records. All fine now
From Brenda at AE Smith