abap AT END OF, nested.

Hi Gurus. I have delivery tomorrow and have run into a problem.

The code is running in to the first "AT END OF" on the first iteration. Any tips or tricks to get around this problem?

sort lt_a category time.

sort lt_b category time account.

loop at lt_a into ls_a.

     AT END OF time.

          (some code)

          loop at lt_b into ls_b.

               AT END OF account.

               (some code)

               ENDAT.

          endloop.

     ENDAT.

endloop.

Thanks

//Mikael