>>We have installed SAP NW 7.4 ABAP system and expectation was to install SAP ECC 6.0 EHP4<<
The best solution here is to re-install or do a system copy of an EHP4 system (source) to the target system. The kernel used by a 7.4 release SAP system is not compatible with an EHP4 system.
The profiles in a 7.4 based system contains not START profile.
The best option in your case is to download the SWPM and start the System copy - Target system creation using DB specific backup and restore and setup the target system.
Restore the database when the installer prompts and continue with the post copy operations.