Try adding the following just above the definition of acs_mail_body__new in file acs-mail/sql/postgresql/acs-mail-packages-create.sql

select define_function_args('acs_mail_body__new','body_id,body_reply_to,body_from,body_date,header_message_id,header_reply_to,header_subject,header_from,header_to,content_item_id,object_type,creation_date,creation_user,creation_ip,context_id');