Hi,
Table RSOSFIELDMAP is applicable for 3.x data flows. For 7.0 data flows please have a look at the following tables:
RSDS - DataSourse
RSDSSEGFD - DataSource Segment Fields
RSTRAN - Transformation
RSTRANFIELD - Transformation Mapping
I think that you have to try table RSTRANFIELD to get similar information of table RSOSFIELDMAP. First you have to go to table RSTRAN for getting the Transformation ID (field TRANID).
Best regards,
Sander