error in accounting interface -no accounting document generated

Hi All,

For a billing document the accounting document is not generated.

The posting status is hsown as "error in accounting interface".

Also the billing date(23rd May) is less than the created on date(2nd June).

I know when we go to the change mode of the billing doc and give the billing date as current date it will realease to accouting.

What I wnat to know is what could be the possible reasons for the billing date being less than created on date and the posting status being "error in accounting interface".

Please help.