Hello,
you can check below OSS notes:
2171867 - EHP4 for SAP SRM 7.0: Compatible Add-ons
2171391 - EHP4 for SAP SRM 7.0 SP stacks - Release & Information Note
2037465 - Important Information about pricing, conditions and scales
1621788 - SAP SRM 7.0 EHP2 ,EHP3 and EHP4: Important info about scenarios
You can also have a look at SAP Help and its documentation:
SAP Supplier Relationship Management 7.0 SAP Enhancement Package 4
Regards.
Laurent.