Synchronization Editor Workflow Step configuration: Synchronization direction in case when ...

Suppose I have defined a synchronization step as follows:

  1. Under the "General" tab "Synchronization in direction" is set to "Target System"
  2. In the "processing" tab I have defined update, insert and delete in both directions for cases A2, B and C (expert view).
  3. The mapping rules of the synchronized object allow synchronization in both directions

In which direction does the synchronization step now synchronize?

According to the configuration under "General", it should only synchronize to the "target system"

However, under "Procecssing"-Tab I have allowed both directions as synchronization direction

Why isn't it possible to specify "both directions"  under "General" "Synchronization in direction"?