Distribution Center doesn't deliver to distribution chain

Dear Retail experts,

I'm trying to create article master record, but the below message appears when trying to maintain 'Sales' view

I've assigned my distribution center 'DC01' to the distribution chain in OVX6N transaction, I've also maintained distribution chain control under SPRO > Logistics general > Basic Data Retail > Distribution Chain Control as in the below screen shot

I selected Org. Structure in MM41 initial screen as in screen shot below

Any ideas how this could be resolved

Thanks,