Payment Process Request Status is "Failed Document Validation"

Hi everyone,

After Create PPR, I got the PPR status "Failed Document Validation".

But there's no any error when view the concurrent request on Form.

I view the output of the concurrent "Scheduled Payment Selection Report", 

there are both of Selected Invoices and Unselected Invoice.

The Reason Not Selected of Unselected Invoices are Scheduled Payment Hold.

Could you please guide me what should I do to pass this step (Submit PPR)?

Thanks,