statement is not accessible

hi i am new at here and ABAP.so i think question is easy for you.

report ztest7.

data xxx type string value 'fenerbahce'.

write xxx.

perform ccc.

form ccc .

xxx = 'galatasaray'.

write xxx.

endform.

write xxx.

this code gives a error which is "statement is not accessible". in the last row.

can you help me.

thanks.

altuko.