SRM5.0 with Backend ECC6.0

Hi experts,

We actually have SRM5.0 / SAPKIBKT08 with Backendsystem Enterprise 4.7 and are upgrading to Backendsystem ECC6.0

In SRM-Customizing 'Define Backendsystem' I should change the Sys.Type accordingly but there is no entry possible for ECC6.0.

Does anybody know what effect this customizing setting has and whether it would also be ok to leave it with R/3 4.7 entry?

Many thanks for your help.

Regards,

Corinne