Diagnosis
You have tried to add a join.
The tables and links defined do not allow a join to be added here
Note that ABAP SQL does not support the following situations:

• The right-hand table of a left-outer join is also the right-hand table
of another joins, that means:
a right table of a left-outer joins can only be linked with a left-handtable.

• A right-hand table of a left-outer joins is the left-hand table of
another left-outer join.

System Response
The desired changes have been cancelled.