Error exploding structured article

Dear experts ,

I need to explode the structure article ( sales set & display articles ) in PO . But the same is not happening & am getting the follwoing message :

Message no. ME466

[ ] No header material found (structured material)

[ ] No components found (structured material)

[ ] Listing conditions incompletely maintained

[ ] Not allowed for single material (industry)

[X] No explosion defined for material category (Customizing)

[ ] Internal error

No components found
Maintain the components for the structured material via BOM maintenance on the "Material" initial screen.
Listing conditions incompletely maintained
Complete the listing conditions:
Perform function
Not allowed for single material (industry)
Enter a material that was created via integrated material maintenance.
No explosion defined for material category
Contact your system administrator. Get the latter to set up the explosion in Customizing
Structured material in the logistical process
.
Internal error
Contact your system administrator.

I have checked the listing as well as config in "Structured Article in Logistics Process" . As per the config the article should explode .

Still i am facing the problem .

Is there any other thing to be checked ?

Pls suggest

Regards

Anis