Payments and Receipts can be deleted from the system, provided you have the correct Access Rights
Deleting Payments and / or Receipts is controlled by Access Rights in System>>Settings>>Access Groups - We recommend that only the System Administrator or Super User should have the right to Un-Ok and delete records.
You first need to be able to Un-OK records, the Action in System>>Settings>>Access Groups is "Un-OK all records", then they can be deleted with Action "Delete All Records"
Also note that with Payments there is an Action in Access to allow invalidating of Payments. This is a another method of removing an incorrect payment, without losing the number sequence.
HansaWorld Support Team