A purchase always concerns exactly one supplier, but can include several deliveries to different delivery locations and times, which can also have a different processing status.
Go to the tab Basis > Purchasing > New and select the company if necessary.
Select the desired supplier by double-clicking. If necessary, you will be asked whether you want to order a consumable or a rental item.
An input window for a new purchase opens. The supplier is already pre-assigned and can no longer be changed.
Select the name of the purchase order from the expandable selection list or complete the list.
To link the purchase to an event, open in the "Events" window and click on Add to open the event search.
Select an existing event from the search results or create a new one via New in the horizontal toolbar of the list. If the event contains a segment with purchase items, it appears on the given date in the Purchase Summary.
Save your input by clicking on the icon in the top left-hand corner of the input window.