Configurable Material BOM is not exploding.

Hi Gurus.

So, the Material I created is:

• Configurable
  In MM03 transaction:
  Basic Data 2 tab > Material is configurable = checked
  Sales Org. 2 tab > Item Cat. Group = 0002 "Configuration"
  
  
  
  
• It has a Sales BOM
  In transaction CS03:
  Usage = 5 (Sales and Distribution Relevant)
  
• Its Variant Configuration profile
  In transaction CU43:
  BOM Explosion = set to Multilevel
  
  
  
• Whithin its corrresnding Item Category
  Structure Scope = "D" Configuration, poss. with BOM explosion
  Therefore the BOM explosion is allowed for this material.
  

Nevertheless, when trying to create a Sales Order through VA01, I get the screens to configure the Variant, but the BOM is not exploded, has somebody an idea about this?

Thanks in advanced!

Regards.