Hello Jepoy,
Tcode KKBC_ORD might be useful for you to get this information.If you need tables then :
Try Tables
AUFK and PMCO
Try function modules
IBAPI_ALM_ORDERCOSTS_READ
K_KKB_KKBCS_CO_OBJECT_READ
Also see this link:
Best of luck
KJogeswaraRao