When editing a diagram and checking for best practicalities there is an warning 'Layout Warning | Edge is going the wrong direction (Sequence flows)'
Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.
How the “orientation check” works and how BPMN identifies a redirect in the sequence flow.
The sequence flow cannot terminate in the opposite direction.
A loop-back gateway is allowed since, while the direction does reverse direction, it does not terminate but rather loops.
KBA , BPI-SIG-PM-MOD-EDT , Graphical Editor for SAP Signavio Process Manager , How To