Hello
A quick search over SCN would've given you the answers.
799639 - IDES - General Information about the usage of IDES systems
Enhancement Packages
From the technical point of view Enhancement Packages can be implemented into IDES systems.
BUT: This is only true if the customer is licensed for all AddOns /
components that are implemented in the IDES ERP System.
Because of this "limitation" we recommend to wait for coming IDES versions/releases that already include the EhP's.
(Please note that the current version of IDES ECC 6.0 already includes
EhP6.)
Regards
RB