DB: Standby recreation error ORA-19870 ORA-19573

The recreation of a standby database failed with the following error:

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 04/23/2018 16:44:52
ORA-19870: error while restoring backup piece 7lt12h1l_1_1
ORA-19573: cannot obtain exclusive enqueue for datafile 201

DG Broken was still on, the solution was, using DGMGRL, to disable the redo apply of the standby database:

DGMGRL> edit database '<standby>' set state='APPLY-OFF';