LS Backup error 4073

Getting an error 4073?

Log Name:      Lync Server

Source:        LS Backup Service

Date:          11/19/2014 8:35:00 AM

Event ID:      4073

Task Category: (4000)

Level:         Warning

Keywords:      Classic

User:          N/A

Computer:      xxx

Description:

Microsoft Lync Server 2013, Backup Service user store backup module detected items having pool ownership conflict during import.

Try to move users mentioned in the error details field from one pool to another and back. If it does not help move them with force enabled.