PSA table for Flat file datasource

Hi,

There is a requirement to identify the PSA table for each datasource in the system.

RSDSTS provides the PSA table for DS except flat file DS.

1. Is there any standard SAP table to identify the PSA table for flat file datasources?

2. Can there be a scenario where multiple PSA tables are mapped to a single DS, if so how to identify a valid table?

Thanks

Sankameshwar