Bill of material change component issue

Dear Experts,

We are facing issue in BOM change with change number.

We replaced A,B,C with X,Y,Z in the BOM with a change number with valid

from date in 2016.

But the system showing the requirement of X,Y,Z in current date,

that is in 2015.

Also it is showing the requirement of A,B,C also.

We need only A,B,C requirment only which is present in the current BOM

and not X,Y,Z which is valid from 2016.

We noticed that, two change numbers with same valid from date, used to change  X,Y,Z

with INN and IND status.

Please explain, how to remove the requirement of X,Y,Z from the system.

Thanks in advance.

Regards,

Suresh.