Posting Purchase Order in Nav 2017.



I am trying to Posting Purchase order (Open Status) and Select Invoice in popup. However I get "There is nothing to Post" Error.

I have Set  posting date and Working date as Current Date. I also checked Quantity to Invoice and Quantity to Receive is not empty and Select Item in Purchase Order Line Type. Status of Purchase order is also Open....


What else i forgot to do or Can you Please let me know how i proceed further to overcome this issue?

Thanks in Advanced.