Hi,
Purchasing organisation is considered as reporting unit and unless you do above said
configuration settings in your system - you would not get condition TAB in your STO purchase order.
Yes,in pricing-you need to assign Schema Group of Purchasing Organization to Purchasing Organization.Generally based on vendor in purchase order,MM Pricing procedure triggers as assignment done for Schema Grp P Org,Schema Grp Vendor and MM Calculation Schema as follow:
Purchasing Organization--Schema Grp P Org---Schema Grp Vendor --MM Pricing procedure
Regards,
Biju K