Storage Location not determined inside delivery document

Hi

The following customization done for Automatic storage loaction, but SL is not determined on Delivery document

1. SL is assigned to Plant

2. SL.Rule ( MALA ) assigned to Delivery Type

3. In delivery item category following switched enabled. " Relavant for picking", "SL required","Determine SL".

4. Assignment of Plant/Shipping point/SL is done..

Still SL is not determined inside the delivery document..

Is the "Storage condition" assignment in point 4 mandatory for "Automatic storage location determination?

Pls help us on the above issue

Anis