This is an old revision of the document!
If one activity is performed once per month and another every time a client's order received then there are two different processes.
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From performers' (organizational, functional) point of view, they update the price list first, then develop the sales plan and finally fulfill the deal.
Yet BPMN means literally what's drawn so we depict the process like this (see how not to) then it will mean that we close exactly one deal per month, which obviously is not the case.
As for the price list, it's usually updated not by a schedule, but in connection with market events that may happen any time.
Therefore, there are three different events in this case, namely a voluntaristic decision to adjust the price list, a monthly deadline for a sales plan, and a purchase request obtained from a client.
It means three different (although connected via data) processes.
(The how to diagram depicts them as black boxes, it is assumed that each process will be expanded on a separate diagram.)