I am using bapi_material_availability for given plant/material/unit/batch and FM is returning values in table WMDVEX as below..
FUNCTION bapi_material_availability.
*"----------------------------------------------------------------------
*"*"Global Interface:
*" IMPORTING
*" VALUE(PLANT) LIKE BAPIMATVP-WERKS
*" VALUE(MATERIAL) LIKE BAPIMATVP-MATNR
*" VALUE(UNIT) LIKE BAPIADMM-UNIT
*" VALUE(BATCH) LIKE BAPICM61V-CHARG OPTIONAL
*" EXPORTING
*" VALUE(AV_QTY_PLT) LIKE BAPICM61V-WKBST
*" TABLES
*" WMDVSX STRUCTURE BAPIWMDVS
*" WMDVEX STRUCTURE BAPIWMDVE
outout
BDCNT REQ_DATE REQ_QTY COM_DATE COM_QTY
00000 12/09/2014 9,999,999,999.000 12/09/2014 8,006,784.00