can u please clarify my doubt

i am validating like

loop at itb.

case itb-spmon+4(2).

when '01'.

i_qty = i_qty + itb-ummenge"quantity

.

.

.

when '10'.

i_qty = i_qty + itb-ummenge.

endcase.

endloop.

loop at itb.

at end of spmon.

jan = i_qty.

....

dec = i_qty.

endat.

endloop.

but it is not giving 10 th 11 th and 12 month fields however these are there in the table.