Error saying "Entry XXXX XXX does not exist in KNA1(check entry)"

Dear Members,

I am facing a error message while creating a Sales Organization by using the Copy button (I am copying the sales organization 1000 ) ,then when the "Change View "Sales organizations":Details of Selected Set is coming I am entering the S.Org code say 1233 and it's name then when I try to enter the name  of the company say "Times Music" in the "Cust.inter-co.bill" textbox , I get the above mentioned error viz. -

Entry XXXX XXX does not exist in KNA1(check entry)

Please help

Thanks & Regrds