Hi,
The list of Subcontract Challans is available through the CIN transaction J1IFR - "List of Challans"
This will give vendor wise list of challans with their status.
Otherwise, why do you need challan details in MBLB?
MBLB is a standard SAP stock report and does not have any integration with CIN module.
Better not to modify the std. report. Instead, use tcode J1IFR
Regards
Prabhu