Storage Locations

Dear Friends

I have one scenario like...

My plant is having 3 storage locations, say 1111, 2222, 3333

in that we have maintaines warehouse number Plant+1111=20

rest of two storage location are are non warehouse related.

Stock is having all the three storage location.

But when ever i created delivery document with reference to sales order the system picks 1111 storage location automatically in the delivery document.

For this i checked pickig location determination , based on that i mainted my order Shipping point ,Plant, Shipping conditions

Can anybady let us know why 1111 storage location picks authomatically i want do the transaction for next two storage locations

Please have a look and let us know your valuable suggesstions

Thanks

Raju.