Note : Destination Requisition requires customer association in the source organization

Hi All, i have careat an item by caring of the checks enables, then create the shipping netwrk b/w two inventory org and enable the check on internal sale order over here too, then i crate an internal location and later assinged this locaiton to destination organization as well, after ward i have maked a custmer and assigend the created locaiton under the ship to of the customer then while i am created the requisition it gives me the note and populated the following note as;
Note : Destination Requisition requires customer association in the source organization
 now i am not geting y this is happening ... kindly let me know the appropriate way for the same ..