Forms :: Subform - Combo Box List Not Populating According To Main Control

I am using MS Access 2010, I have three tables,

Policies (Id, Client Id, Address, Policy Amount, Paid)
Payments (Id, Client Id, Total Amount)
Payment Details (Payment Id, Policy Id, Paid Amount)

I have created a form "PAYMENTS" that include a sub form "PAYMENT DETAILS".

In the sub form control Policy Id is defined as combo box, and retrieving the list from Policies and Payments where Policies.Client=Payments.Client the query of Combo Box is as follows:

Code:

SELECT POLICIES.[POLICY ID]
FROM POLICIES
WHERE (((POLICIES.PAID)=False) AND ((POLICIES.CLIENT)=[Forms]![PAYMENTS]![ClientId]));

Only first time Combo Box display the Policy Ids according to the Client, but when I change the client and always displays the previous clients Policy Ids.

how to retrieve correct list of Policy Ids according to the Input Client in Payments.Client control