OnReadyState error for adding the receipts from the custom work alert

On : 9.2 version, Receiving

OnReadyState error for adding the receipts from the custom work alert 

Custom Workalert is created which fetches the data and displays in the grid format. A pushbutton to "Add Receipts" which allows the user to add the receipts for the selected Purchase Order (PO). The control is transferred to Add/Update Receipts (Main Menu > Purchasing > Add/Update Receipts) component using TransferModeless peoplecode function. 

I have attached the screenshot of the error.

PeopleCode that used 

TransferModeless(MenuName.MANAGE_SHIPMENTS, BarName.USE, ItemName.RECV_PO, Page.RECV_WPO, "A", COR_MISSRCPT_VW.BUSINESS_UNIT, COR_MISSRCPT_VW.PO_ID);