Transfer Rules are Missing InfoSource

Hi,

Recently I have performed system copy of a BW system (NW7.4 SP5).

During source system restore in RSA1, the following popped up:

"Transfer Rules xxxxxx_HIER_xxx are Missing InfoSource xxxxxxx
Cannot Restore

You must have to recreate all rules with changes.
Do you want to do this now?"

Affected are the hierarchy datasources. The rest are working fine.

I am from technical basis background, hence I have limited knowledge on this. When checking the datasource itself, it has version "Modified", and Active Version "Does Not Exist". Any idea why this is happening to hierarchy datasources?

Any input is greatly appreciated. Thanks.