Can't display 10 subtotals in ALV

Hello Everybody

I would like to know if in ALV you can display 10 subtotals

I have an ALV Report displaying 9 Subtotals but when I try to create another subtotal , it just disappear

For instance

I have this code 5 times for Field EBELN and 5 Times for Field IHREZ  But when I add an extra Subtotal , nothing is display as subtotal , just an Standard list is display

CALL FUNCTION 'Z_GENERA_SORT_ALV'
       EXPORTING
         field   = 'UNSEZ'
         up      = 'X'
         subtot  = 'X'
         pos     = 01
       TABLES
         gt_sort = gt_sort.

CALL FUNCTION 'Z_GENERA_SORT_ALV'
       EXPORTING
         field   = 'IHREZ1'
         up      = 'X'
         subtot  = 'X'
         pos     = 02
       TABLES
         gt_sort = gt_sort.

Any help highly appreciated