How To Fix PPECMP604 - Relationship of &1 to &2 creates recursion via follow-up material in BOM

SAP Error Message - Details

• Message type: E = Error

• Message class: PPECMP - Messages for iPPE CMP Application (Components)

• Message number: 604

• Message text: Relationship of &1 to &2 creates recursion via follow-up material in BOM

What causes this issue?

The created or changed relationship of node &V1& to node &V2& creates a
recursion involving a bill of material and a follow-up material.
&V4& is the follow-up material to &V3&.
One material that you are using in the nodes <(>,<)> is likewise a part
of a bill of material. As a result, the product structure becomes
recursive, as follows:
Either directly by an immediately-assigned other node and its material
reference in the bill of material, or by a different material in this
bill of material
Or indirectly by a different material that exists in the product
structure and likewise has to be part of a bill of material
In the present case, the recursion is caused by a follow-up material.

System Response

The relationship is not created.

How to fix this error?

Start the recursivity analysis with the materials you have used in the
nodes &V1& and &V2&, and check the bills of material <(>,<)> in which
the materials &V3& or &V4& are used. The original error can also lie
with other materials in the product structure that exist in bills of and
have follow-up materials.

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message PPECMP604 - Relationship of &1 to &2 creates recursion via follow-up material in BOM ?

  The SAP error message PPECMP604 indicates that there is a recursion issue in the Bill of Materials (BOM) due to a relationship between two materials. Specifically, it suggests that the relationship between the two materials (denoted as &1 and &2) creates a circular reference, which can lead to infinite loops during processing.
  Cause:
  The recursion typically occurs when:
  
  A material (e.g., a component) is defined in the BOM of another material (e.g., a parent) in such a way that it indirectly refers back to itself through a series of relationships.
  There are follow-up materials or alternative components that create a loop in the BOM structure.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review BOM Structure: Check the BOM for the materials involved. Look for any circular references where one material is listed as a component of another, which in turn is a component of the first material.
  
  
  Identify Relationships: Analyze the relationships between the materials. Ensure that no material is indirectly referencing itself through other materials.
  
  
  Modify BOM: If you find a circular reference, you will need to modify the BOM. This may involve:
  
  Removing the problematic component from the BOM.
  Changing the structure of the BOM to eliminate the recursion.
  Ensuring that follow-up materials do not create a loop.
  
  
  
  Use BOM Change Transaction: Use transaction codes like CS02 (Change BOM) to make the necessary adjustments.
  
  
  Testing: After making changes, test the BOM to ensure that the error no longer occurs and that the BOM functions as expected.
  
  
  Related Information:
  
  BOM Structure: Understanding how BOMs are structured in SAP is crucial. Familiarize yourself with the concepts of parent and component materials.
  SAP Documentation: Refer to SAP Help documentation for detailed information on BOM management and error messages.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CS01 (Create BOM), CS02 (Change BOM), and CS03 (Display BOM) for managing BOMs.
  Consulting with Colleagues: If you are unsure about the relationships or how to resolve the issue, consult with colleagues or a SAP expert who has experience with BOMs.
  
  By following these steps, you should be able to identify and resolve the recursion issue indicated by the PPECMP604 error message.