---
title: Prevent the accidental deletion of a target system
description: If a source resource is empty, the default behavior is to exit without failure and to log a warning similar to the following:
component: pingoneaic
page_id: pingoneaic:idm-synchronization:prevent-accidental-deletion
canonical_url: https://docs.pingidentity.com/pingoneaic/idm-synchronization/prevent-accidental-deletion.html
keywords: ["Synchronization", "Mappings"]
section_ids:
  preventing-accidental-deletion-ui: Prevent accidental target deletion using the IDM admin console
---

# Prevent the accidental deletion of a target system

If a source resource is empty, the default behavior is to exit without failure and to log a warning similar to the following:

```
[318] Feb 19, 2020 1:51:56.455 PM org.forgerock.openidm.sync.NonClusteredRecon dispatchRecon
WARNING: Cannot reconcile from an empty data source, unless allowEmptySourceSet is true.
```

The reconciliation summary is also logged in the reconciliation audit log.

This behavior prevents reconciliation operations from accidentally deleting everything in a target resource. In the event that a source system is unavailable but erroneously reports its status as up, the absence of source objects should not result in objects being removed on the target resource.

If you *do* want reconciliations of an empty source resource to proceed, override the default behavior by setting the `allowEmptySourceSet` property to `true` in the mapping. For example:

```json
{
    "mappings" : [
        {
        "name" : "systemCsvfileAccounts_managedUser",
        "source" : "system/csvfile/account",
        "allowEmptySourceSet" : true,
        ...
```

When an empty source is reconciled, the data in the target is wiped out.

## Prevent accidental target deletion using the IDM admin console

1. From the IDM console, click Native Consoles > Identity Management.

2. From the navigation bar, click Configure > Mappings, and click the mapping to edit.

3. Click the Advanced tab, and expand the Additional Mapping Options node.

4. Enable Allow Reconciliations From an Empty Source.