Import and Export in 4.6b

Hi All,

I have a syntax regarding Import and Export statements which are not working in 4.6b. Below is the statement.

IMPORT ID = (Internal Table) FROM DATA BUFFER ( String Variable ).

EXPORT ID = (Internal Table) TO DATA BUFFER ( String Variable ).

What can we have alternate to above statements ?

Actually I need to transfer or export some internal table content to String and Import the same data from string.

I am looking perticularly about buffer only. If not that what can we have alternate to that ?

Thanks,

Ram