NWGW BOR Purchase Requisition Data Model

Hi,

I am trying to create an app which creates a purchase requisition in our SAP ECC system. I am creating a gateway service using a BOR generator. I plan to use the following

PurchaseRequisition BOR

     GetItems - for the QUERY operation

     GetDetail - for the READ operation
     CreateFromData1 - for the CREATE operation

However after I create and generate the service for the QUERY operation and try to test it in a browser, I get this error,

  <message>Please pass on parameter for open or closed purchase requisitions</message>. I'm not sure what parameter to pass and if I've mapped it GetItems correctly. This is what my mapping looks like,

Regards

Jing Jing Tao