Hi Lesson 13 Practice 2 gives you a sequence workflow and gets you to convert it into a flowchart as there are lots of decisions which can be more easily read in a flowchart form.
I think there is an issue with the model answer logic
Here is a section from the original sequence version
and here is the model flowchart answer.
The sequence is saying if there is NOT missingSAPdata then Open billing app (the title describes correctly but the Open Billing sequence should be in the Then activity box, I believe)
The flow chart is saying if there is missingSAPData then open billing app