Bom Not exploding in cj20n

Dear Experts,

I am trying to explode the BoM in cj20n.

Have maintained REFERENCE material in external activity.

Also, done the  below mentioned steps.

You need to select the material from right screen.

1. In the left, click on Activity (BOM Explosion test)

2. In the right detail screen, click on component overview screen

3. Select the line item and do Edit - Component - Explode bom or Ctrl+F6

PLease advice.

Regards

Rohit