You can get the relative record number (RRN) or relative byte address (RBA) for VSAM entry-sequenced data sets (ESDSs) and relative record data sets (RRDSs).
Return the RRN or RBA in the following ways:
Prefix records with the RRN or XRBA value when you select these options in the data map properties.
Include the RRN or RBA value in a new field in the record when you use the GetDatabaseKey function in an expression.
If you request offload processing, you cannot use the GetDatabaseKey function in an expression.