Manage HL7 Priveleges and how to purge hl7 errors?

Hi my I am sending hl7 messages to openmrs but now my hl7_errors queue is full and I want to purge it so I went to the Privileges to see whether I can do it there and I found out that there is lock beside it. Does it mean I cannot do it?

What do these locks mean when I am logging as admin?

How can I purge hl7 error messages?

Issue SOLVED SEND the messages from the hl7_error_queue to the hl7_in_queue. used the DELETE query to delete all messages in the hl7_in_queue from the database.