BOM_ECM Issue

Hi Experts,

I am facing an issue with the deletion of a BOM component which is change number managed.

For an assembly A, component B is ECM managed. The validity date is showing from 04.02.2014 to 20.10.2015.

For this component B we have a sub-component C which is showing validity between 01.04.2007 and 01.04.2007 (in the back date).

After deleting this subcomponent C, still we are observing the assembly checkbox of B as checked.

Can you please let me know the root cause.

Thanks and regards,

Kaushik