Hello Safiq,
Try user-exit PCSD0007 ( Function EXIT_SAPLCSDI_007 and includeZXCSAU11 ).
Also have a look at PCSD0005 ( Function EXIT_SAPLCSDI_006 and includeZXCSAU10 ).
The list of exits in this area is:
PCSD0001 Applications development R/3 BOMS
PCSD0002 BOMs: Customer fields in item
PCSD0003 BOMs: Customer fields in header
PCSD0004 BOM comparison
PCSD0005 BOMs: component check for material items
PCSD0006 Mass changes user exit
PCSD0007 Check changes in STKO
PCSD0008 WBS BOM: Customer-specific explosion for creating
PCSD0009 Order/WBS BOM, determine URL page
PCSD0010 Order/WBS BOM, determine explosion date
PCSD0011 Knowledge-based order BOM, parallel update
PCSD0012 Customer - Mat. number/mat. number during material exch
PCSD0013 Customer-specific processing of an explosion for BOM br
Regards
KJogeswaraRao