Query linked help

Dear All,

Need your help, how to build query to pull out open Purchase order, GRN and AP Invoice if user using AP reserved invoice.

Sample transaction as below:-

1. PO -> AP Reserved Invoice -> Payment

2. After received invoice , user proceed GRN copy from AP Reserved invoice.

Currently i'm able to pull out transaction based on PO -> GRN -> AP Invoice

Please help

Thanks,

Saufil