problem in LSMW ?

Hi,

With reference to SDN supplied "LSMW to Update Customer Master Records with Transaction Recording" demo example.

when i am doing 1st step maintain object attribute during "Customer change : intial screen" when i giving data those are given in SDN demo Customer 1000,sales organijation 1000,distribution channel 10,division 00 by entering all these and checking the sales box. My save button remain Dissable how i will procede ? whats the problem ?

Thanks

Arya