Unable to pass multiple search parameters when fetching PO using rest API

Summary:

Hi, We are unable to pass multiple search parameters when fetching Purchase Order Detail and line detail through API. We tried parameters fscmRestApi/resources/11.13.18.05/purchaseOrders?q=OrderNumber={OrderNumber}&q=lines.Item={ItemNumber}&expand=lines. This is returning entire detail at line level for all lines.

We would like to fetch po line details for specific item number and when user enters purchase order number and item number.

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