load sales order problem with lsmw direct input

hi all,

i am using lsmw direct input to upload sales orders, but the log said: date..in valid.

the 3 source structure i maintained below:

zvbak(header):zid,AUART,VKORG,VTWEG,SPART

zvbpa(partner):zid,PARVW,KUNNR

zvbap(line):zid,MATNR,ZMENGC

the flat file looks like this:

0 ZZZ ZZZZ ZZ ZW

1 AG 100082

2 658 1

at begining, i did not maintain the date fields such as VDATU, but goes wrong as the log said above. and then i try to add some date fields (such as VDATU,ANGDT,BNDDT,GUEBG,GUEEN) into my source structure and flat file, and the fomat are all yyyymmdd, but the log still said the same thing: date.. in valid.

can anybody tell me what's wrong indeed? should i maintain all the date fields or even all other fields, or just i have use a wrong fomat?

thank you all for any reply on this.