Component Allocation for multiple alternative bom in routing in CA02

Hi All,

I am facing issue in BDC for selecting BOM especially when its more than alternate bom 1 ,is there a standard bapi/fm to do that smoothly,checked old blog also couldnt find useful bapi/fm using CA02

tried to use CX_ALLOCATE_COMPONENT_ROUTING this fm too but its now working,pls guide if anyone has done it

Regards