Discrepency in output

Hi All ,

I have a query , in the below code

wa_exceplist_inv-ADC_VARIANCE = wa_exceplist_inv-AVERAGE_DAILY_CONSUMPTION -

wa_exceplist_inv-PREVIOUS_ADC.

the values for the fields are

wa_exceplist_inv-AVERAGE_DAILY_CONSUMPTION = 25.50

wa_exceplist_inv-PREVIOUS_ADC = 0.00

but the output in the field wa_exceplist_inv-ADC_VARIANCE is 0.00 where in it should be 25.50 ,

the date declaration for the above fields are :

AVERAGE_DAILY_CONSUMPTION type erdz-I_ABRMENGE,

PREVIOUS_CONSUMPTION TYPE erdz-I_ABRMENGE,

PREVIOUS_ADC type erdz-I_ABRMENGE,

ADC_VARIANCE type erdz-I_ABRMENGE,

where erdz-I_ABRMENGE is of the type DEC .

can anyone please give some suggestions on this .