Illegal left outer join between tables & - & - &.

What causes this issue?

In the definition of a join, this operation would result in a reference
of the right table of a left-outer join to the right table of another
left-outer join.
This is not allowed.

System Response

The incorrect link was removed or converted to an inner join.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.