Online Consistent brbackup - How does SAP lock the archive files?

With an Oracle online consistent brbacup, i believe that SAP locks the archive log files so they are not deleted during the backup.
How do they do this?
If a backup crashes how do I unlock these locks?

Here is the statement (from the netbackup trace) that caused brachive to stop.
Set file /oracle/BP1/oraarch/BP1arch1_207989.dbf to QUIESCE status.
Here is relevenmat part of the NetBAckup/backint log...
5:21:36.691 [11248] <4> adjustObjectStatus: File </oracle/BP1/oraarch/BP1arch1_207989.dbf> in VxBSA_INPROGRESS status. No ch
ange of status needed.
15:21:36.691 [11248] <4> adjustObjectStatus: Done.
15:21:36.691 [11248] <4> VxBSAWaitForFileListStatus: INF - entering WaitForFileListStatus.
15:21:36.691 [11248] <4> bsa_handle_std_backup: INF - entering bsa_handle_std_backup.
15:21:36.691 [11248] <4> bsa_comm_w_bkar: INF - entering bsa_comm_w_bkar.
15:21:38.714 [11248] <4> bsa_comm_w_bkar: Recieved bpbkar message: #END /oracle/BP1/oraarch/BP1arch1_207989.dbf
15:21:38.714 [11248] <4> bsa_comm_w_bkar: Comparing physical file path: /oracle/BP1/oraarch/BP1arch1_207989.dbf
15:21:38.714 [11248] <4> bsa_comm_w_bkar: to file from bpbkar message: /oracle/BP1/oraarch/BP1arch1_207989.dbf
15:21:38.714 [11248] <4> bsa_comm_w_bkar: File paths matched.
15:21:38.714 [11248] <4> bsa_comm_w_bkar: Set file /oracle/BP1/oraarch/BP1arch1_207989.dbf to VxBSA_UNQUIESCE status.
15:21:38.714 [11248] <4> bsa_comm_w_bkar: Recieved bpbkar message: #BEGIN /oracle/BP1/oraarch/BP1arch1_207989.dbf
15:21:38.714 [11248] <4> bsa_comm_w_bkar: Comparing physical file path: /oracle/BP1/oraarch/BP1arch1_207989.dbf
15:21:38.714 [11248] <4> bsa_comm_w_bkar: to file from bpbkar message: /oracle/BP1/oraarch/BP1arch1_207989.dbf
15:21:38.714 [11248] <4> bsa_comm_w_bkar: File paths matched.
15:21:38.714 [11248] <4> bsa_comm_w_bkar: Set file /oracle/BP1/oraarch/BP1arch1_207989.dbf to QUIESCE status.
15:21:38.714 [11248] <4> bsa_comm_w_bkar: File /oracle/BP1/oraarch/BP1arch1_207989.dbf not in VxBSA_NOTREADY state.
15:21:38.714 [11248] <16> bsa_comm_w_bkar: Can't change state.
15:21:38.714 [11248] <4> do_file_backup: The sequence of calls is incorrect.
15:21:38.715 [11248] <4> do_backup: Exit with status: <2>.
15:21:38.715 [11248] <4> /usr/sap/BP1/SYS/exe/run/backint 6.0: **************************************************************

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