PM Change Entries Error - Unable to Lock the Batch Record

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While trying to void a charge using the Change Entries task in Property Management, I keep getting this error. I haven't been able to find anything in the Knowlegbase or forums regarding this message. I have confirmed that the GL period I'm working in is open and I have no other tasks that are accessing the change entries batch or the batch that created the original charge.

Can anyone tell me what it means and how to 'lock the batch record' so I can void the charge?