​@audreyS 

A parked payment is an unidentified payment received/ payment done which recorded in the system without being linked to a specific customer or supplier. As an example, A payment is received into company bank account, but no invoice reference or customer/supplier information is provided to identify who made the payment.

Parked payments always appear in the List of Values (LOV) under "open items. Since parked payments are not tied to a specific entity, they can be matched or offset against any open customer or supplier item once the payer is identified, or the appropriate invoice is located. Once the payer or corresponding invoice is identified, manually match the parked payment to the appropriate open item in the system.

So when comes to the Parked Supplier Payments Analysis window. This window act as a information window so all the parked payments are appearing in here. So even though amount is zero , it still appears. 

We use this parked Supplier Payments Analysis window to view information on parked supplier payments.

Hope this answer will clarify your question.

BR

Sanduni

hi ​@Sanduni Ariyarathna 

Thank you very much for your help. It's very clear to me now.