APR_DIA10100 is a Deduction in Arrears work table. I'm not at all familiar with the Deduction in Arrears module but you could potentially check that table for records from today or with this pay run's check date. There's got to be something in there that when you try and recreate your payroll, it is getting duplicated and therefore causing the Primary Key duplicate. Hopefully someone else can chime in with a little more info.
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