Source &1 for product &2 in &3 is excluded due to cycle

What causes this issue?

There is a recursiveness relationship (cycle) in the order chain, as
product &V2& in location &V3& should be procured again from locattion
&V3&.

System Response

Product &V2& from source &V1& is not externally procured again, as
otherwise the system could fall into an endless loop.

How to fix this error?

Check if there is a recursiveness relationship for the transportation
lanes between locations &V1& and &V3&, in the Supply Chain Engineer.
If recursiveness relationships are allowed in the Supply Chain Model
check the planning result after each planning.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.