We are planning for ECC upgrade from source version of R/3 4.7 to EHP6 for ERP6.0.
We also have CRM4.0 in this landscape. I need to understand if this is Compulsory to upgrade CRM as well ? OR CRM4.0 is compatible with EHP6 for ERP6.0.
I would like to have any SAP reference note/document on Release combination CRM and ECC.