Infosource not avialable in the source system

Question: Hi BW Gurus,
We upgraded to BW 3.52 from 2.0b. We used to transfer data from 0cust_sales (master data) object to some other custom object. We had created data source from 0cust_sales (80custsale) to transfer data. This is all in BW system only.

After upgrade I tried to activate the transfer structure of our custom object. It is saying "Infosource (80custsale) not avialable in the source system". I can see the data via rsa3. But cannnot able to activate my transfer rules.
Is it issue with upgrade or am I missing something? Please advice.

Thanks in advance.

Answer:
Did you also replicate the internal BW source system? Do you see it if you double-click the source system to view the datasources?
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