user exit for BOM

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hello,....

problem: using BOM in VA01...for free goods material.....

I am working on user exit for BOM...I need to write a code in FV45SFCO_CONFIGURATION_SET_STM under this we have call customer funcion '003'

if we click on this we will enter in include ZXVVAU12.....In this including I need to write the code(user exit) by using XSTB table and the values in that table I have to populate in XVBAP.......for the BOM Explosion........when we use VA01......

so please tell me how can i write the code in that exit ...by getting the data from XSTB to XVBAP........by using the field STLAL (It is Alternative BOM in BOM Screen)...for example if I select '05' (stlal) BOM type.....the values in XSTB populate in XVBAP...

anyone help me on this........

Otherwise give me any other sample code for the userexit BOM so that I will learn...a lot from that....

Thanks in advance,

Madhu