&CAUSE&
In this purchase order, it is noted that it should be created using theclassic scenario. See path in Customizing (IMG): Enterprise Buyer
-> Cross-Application Basic Settings ->Activate Extended Classic Scenario
At the same time however, the extended classic scenario is deactivatedvia a Business Add-In. Seepath in Customizing: Enterprise Buyer -> Business Add-Ins forEnterprise Buyer -> Control ExtendedClassic Scenario

System Response
The system displays the error message when checking or changing apurchase order. The purchase order document cannot be posted.Test reference to messages

Procedure
Change the Customizing settings above so that both activities activatethe extended classic scenario.