STILL NOT WORKING USER CAN'T VALIDATE PO RECEIPT

To post goods receipt inventory user need access to Purchase order line.  But not the purchase order.

Go to Settings->Users & Companies->Groups. Search for Inventory group and select Inventory/Users and open it.  Go to tab Access Rights and find the models for purchase. Remove read access for Purchase order, but keep read access to Puchase order line. 

In my test (V16 EE) this allowed posting goods receipt, but blocked access to open purchase order.