Only accounted invoices should reach PPR

Summary:

At present invoice workflow is like validation-->approval--->accounting
But even unaccounted invoices getting payment done. Requirement is only accounted invoices should reach payment.
For this we enabled invoice option: Require accounting before approval"
observation: only approved invoices getting selected in PPR and its fine.
Issue: even unaccounted invoices getting approved which should not happen.
How to address this issue. Please guide

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