How To Fix MC676 - Relationship structure of & & inconsistent

SAP Error Message - Details

• Message type: E = Error

• Message class: MC - Aggregate: views, matchcodes, lock objects

• Message number: 676

• Message text: Relationship structure of & & inconsistent

What causes this issue?

The foreign key relationship between the base tables of a view or a
lock object could not be read.
There is probably an inconsistency because of subsequent foreign key
modifications.

System Response

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

How to fix this error?

Check whether the foreign keys between the base tables are still
correctly defined.
If this is the case, save the table relationships in the view or lock
definition again and activate the object again.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC676 - Relationship structure of & & inconsistent ?

  The SAP error message MC676, which states "Relationship structure of & & inconsistent," typically occurs in the context of Material Management (MM) or Production Planning (PP) modules when there is an inconsistency in the relationship structure of a material or a bill of materials (BOM). This inconsistency can arise from various reasons, such as incorrect data entries, missing relationships, or issues during data migration.
  Causes:
  
  Inconsistent BOM Data: The BOM may have been altered, and the relationships between components and the parent material are not correctly defined.
  Missing or Incorrect Relationships: There may be missing links between materials or incorrect assignment of components in the BOM.
  Data Migration Issues: If data was migrated from another system, inconsistencies may have been introduced during the transfer.
  Changes in Material Master: Changes in the material master data that are not reflected in the BOM can lead to inconsistencies.
  Versioning Issues: If multiple versions of a BOM exist, there may be conflicts between them.
  
  Solutions:
  
  Check BOM Structure: Use transaction code CS03 (Display BOM) to review the BOM structure for the material in question. Ensure that all components are correctly assigned and that there are no missing relationships.
  Recreate BOM: If the BOM is severely corrupted, consider recreating it from scratch to ensure all relationships are correctly defined.
  Use Transaction Code C223: This transaction allows you to check and correct the BOM relationships. You can analyze the structure and make necessary adjustments.
  Data Consistency Check: Run a consistency check using transaction code CTC1 or CTC2 to identify and correct inconsistencies in the BOM.
  Review Material Master Data: Ensure that the material master data is complete and accurate. Check for any changes that may have affected the BOM.
  Consult SAP Notes: Check the SAP Support Portal for any relevant notes or patches that may address this specific error.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CS01 (Create BOM), CS02 (Change BOM), and CS03 (Display BOM).
  SAP Documentation: Refer to SAP Help documentation for detailed information on BOM management and troubleshooting.
  User Forums: Engage with SAP community forums or user groups for shared experiences and solutions from other users who may have encountered the same issue.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with your SAP support team or a technical consultant who can provide deeper insights into the specific configuration and data setup in your SAP environment.