Custom Records Filtered in Screen Create Requisition - Acumatica

In this post, I want to share how to custom records filtered in screen create requisition in Acumatica.
Screen Create Requisition is used to process request data to be requisition.
In this case, I have added new custom field in Request header (RQRequest) named Process.

Then, I want to custom screen Create Requisition. I need records that can be processed in screen Create Requisition only Request that Process = "PO" only.

So, I need to custom the graph RQRequestProcess.