Flat file data load errror for Dates

Question

hi
i am loading data thru flat file to Cube Daily.
Data is like:
order no....date1.............date2.......amount
1122..........20090101..20090102.....100
1123..........20090101..20090102.....500
1124..........20090101.......................200
now for some values the Date2 is empty
so when i load the flat file it gives a dump....
"Incorrect value for Date2 on record no. 3"
how to correct this??
there is a good possibility that date2 will be empty for certain records

Answer 1

thank you very much for your patience.....
are you sure you are on BW 3.5
i cannot do display datasource anywhere !!!!
here are my options that i see in my bw 3.5 systems
if i click on Infosource i see the option of Assign datasource but not display datasource
if i right clik on source system i can see the option of change transfer rules, delete transfer rules etc. but no option of display datasource
if i right click on infopackage i can see option of change,rename,delete etc.
in source systems tab
if i right click on Datasource , i see change transfer rule option & object overview only
when i double click on change transfer rules, i see the option of
datasource/transfer structure and Transfer rules tab only
in datasource/transfer structure i see that output length is 8 and it is characteristics
in object overview i dont see any tab of fields /format
and also communication structure