There is no automatically deleting the cheque data.
SAP has provided different transaction codes for delete or reset cheque information
FCHG / FCHE / FCHD
However, you should never use them in production system, unless there is a business reason to do so. Any erroneous execution of such programs would have catastrophic consequences.
The cheques voided cannot be deleted, as they are the very means of your future audit log. I do not think your auditors would appreciated and accept this deletion practice.