Get number of used elements of an internal table

hi,

there is probably a way to get the number of used elements in a table but i 
haven't found it. could someone tell me where to look or how to do that.

my code so far:
<snippet>
0023.06  
*************************************************************************       
                                     040
0023.07  *    Dateien                                                           
 *                                            040
0023.08  
*************************************************************************       
                                     040
0023.09 FBS_MSG_ID IT   F    7        DISK                                      
                                              040
0023.10  *                                                                      
                                              040
0024.00  
*************************************************************************       
                                     040

</snippet>

<snippet>
0078.04 D statusArray     S              7A   DIM(100)                          
                                              040
0078.05 D                                     PERRCD(1)                         
                                              040
0078.06 D                                     FROMFILE(BS_MSG_ID)               
                                              040

</snippet>


the bif %elem seems to return the max number of elements of a table, in my case 
100.

thanx in advance for any help

mihael knezevic