production order

HI SAP GURUS,

I have a finished material,for that material i have two alternative bom as well as two routing .but when i am creating p.o ,system giving me pup up for selecting which routing u want.i am selecting 2nd one.

but in order it is taking first one,when i am checking bom structure in production order.

how i wll customize.

plase suggest me.

regards