Hi Sravan,
As Dave pointed out, I think you are missing M5000 which is part of standard Activity NZEXN.
You may have to complete that to see your print outputs ready for processing. And moreover you default data setup is just capable of defaulting your customs invoice messages. So, you don't see M5000 in the communication tab,
Please make sure you maintain defaulting with respect to the sequence. You should find M5000 under communication tab and once you complete the entire sequence you will find Z2004 and Z2354 enabled.
Regards
Dhilipan