Small Clarification

Hi all,

I need a basic clarification.There are many datasources in R/3 (ECC) which has to be replicated as

3.5 infosurces and we need to modify transfer rules and update rules.

There are some datasources where we can use them as 7.0 datasources and transaformations needs to be used.

Please explain which datasources are still 3.5 and which are available as 7.0

Is there any specific procedure to follow

Thanks