Transaction Methods in Interbase using Delphi 3.0 -Problems in commit-rollback methods

For Transaction methods -  like commit I am using
commit method its working fine.

if I type a new record  and rollback - an error message is stating that
record not found - but by using cache method type transaction working fine -

But I would like to work rollback method without cache update method -
Please give me the solution for the above stated problem immeditely

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