Postman name cannot be changed once articles are invoiced to that beat on the day.
Anyway, please run attached script and replace new Postman exe and dlls by downloading from http://www.sendspace.com/file/fvxlji . The issue will get resolved.
In Meghdoot Update 3 after modifying the Postman name in Supervisor. The postman name appears twice while taking returns (Old Postman Name+New Postman Name). Because of this bug day end cannot be done. Now CEPT MYsore has Provided two exl to solve this issue
DOWNLOAD POSTMAN EXE AND DLL FILES FROM
Centre for Excellence in Postal Technology
Nazarbad, Mysore 570010
Ph: 0821 2449015
Fax: 0821 2440526