Hi,
Check in ECC- you have facilities to print Multiple ERS invoices!
If your ERS invoice created and not printing- Just cross check and select check box of "Multiple issuing" in General data TAB by using t.code: NACE,select "MR" Application - > Output types - > Click your ERS Output type.
Now try ERS document again and print ERS invoice, and then try to re-print your ERS Invoice.
Regards,
Biju K