How to find BOM without Linkage to Equipment or Matertial ?

Experts,

I am an Technical Consultant. I have below requirements.

1) Materials link to Equipment without 9BOM.

2) 9BOM without linkage.

3) Equipment without linkage.

I analysed two tables named EQST and STPO.

In table EQST, i am not able to find any Equipments having blank BOM. Also, i am not able to find any BOM's having blank Equipment number.

In table STPO, for category 'M', i am not able to find any BOM's having blank Component (Materials). Category 'E' have BOM's that have blank Components. But, is it right way of checking it ?

Does the above scenario mean that, there are no BOM's that are not linked to any Equipment or Material ?

Please highlight the ways to find the above requirements.

Thanks,

Gaurav.