Under the Create tab you, will find a section called What-if analysis. Here you select against which requirements the purchase order shall be analyzed.
Here you can perform a sensitivity analysis to see what will happen if an arrival will be delayed. Under the Include in analysis, you can also choose to search for actual requirements via manufacturing order suggestions.
Further down, you can manually configure order rows for the purchase orders that shall be analyzed. If you have linked to this procedure from another procedure, the order is selected by default.
You start the analysis by clicking on Run in the Window functions. You will see the result of the analysis under the What-if analysis tab.