Structure fragmentation and field symbol

Hi,

Can someone help me understand how the below code works?

In the above code, it makes sense when the below statement throws an error as a result of structure fragmentation within unicode programs.

*lv_string = s1.

What I dont understand is how the data object <fs_x> can hold the contents of the structure 'S1'? The object <fs_x> is declared as type X which would make it 1 byte variable where as the structure S1 is more than 1 byte

Thanks,

Vikram.M