WBSP-AS-000120 - The WebSphere Application Server automatic repository checkpoints must be enabled to track configuration changes - depth
Without enabling repository checkpoints, you will not be able to determine the history of changes to WebSphere configuration files, and who made those changes.
From administrative console click System administration >> Extended repository service >> Enable automatic repository checkpoints. Enter a 'checkpoint depth value' according to the security plan. Restart the DMGR and all the JVMs.