Using a material with serial number in bom

Hi all,

We want to add a new product and need to use the one we have already produce(has serial number) in a different one. For Example;

1000xxx - the one we produce and sell(has serial number)

1000yyy- the new one that we use three of 1000xxx (also must have serial number)

After i create bom in cs01 and plan in ca01, try to open a production order in co01 and try to put check in Indicator specifying that the material component is backflushed on the line 1000xxx material and save, system errors.

Hope i can explain.

Thanks for your support.