When Lisp is enabled, a locator set is configured and PITR feature is tied to the locator set:

PUT /restconf/config/lisp:lisp
{"lisp":{"enable": true}}
PUT /restconf/config/lisp:lisp/lisp-feature-data/locator-sets/locator-set/loc01

,...}
PUT /restconf/config/lisp:lisp/lisp-feature-data/pitr-cfg
{"pitr-cfg": {"locator-set": "loc01"}}
]}}}]}}

And I try to remove all Lisp settings:
DELETE /restconf/config/lisp:lisp

The response is code 500: TransactionCommitFailedException