LD Schedule Error message

There is an error while Auto Building LD Scedule.
"PRINCIPAL ZERO ON YYYYMMDD BEFORE MATURITY DATE"

Please guide and advsie how and what to check?

There has to be a principal repayment on Maturity Date. In your case, the principal becomes zero even before the maturity. Check the P type schedules defined

Thx for reply...We are crating schedule and providing Principa amount for the Schedule with I tpe schedule as well, This to create schedule automatrically. But Before creating P and I we have Minimum 1 B Schedule type and then P and I is built.
My question is that under what circumstance this would go wrong. i.e. becasue fof Interest rate? or some other information need to be verified.

thx for update, the issue has been resolved, as user was keying in wrong amounts.

thankx