Sub assembly not showing in indented BOM

In this drawing of an assembly with sub assemblies one of the subs is not showing as such in the indented Bom.

In the picture the sub is high lighted in the FM but not showing in item 4 of the Bom.

The other subs are showing correctly.

How can I get the BOM to recognize it?

On a side point - Why do my drawing pictures look so unclear?

Regards,

SolidworksBill Of Materials