How To Fix MC543 - Mandatory key fields were applied automatically

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 543

• Message text: Mandatory key fields were applied automatically

What causes this issue?

An aggregate contains several tables. All the primary key fields which
are not also foreign key fields of the tables included in the aggregate
must be fields of the aggregate. The latter are redundant because they
contain the same values as the corresponding primary key fields.

System Response

The system automatically adopted these mandatory fields.

How to fix this error?

No action necessary.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC543 - Mandatory key fields were applied automatically ?

  The SAP error message MC543, which states "Mandatory key fields were applied automatically," typically occurs in the context of Material Management (MM) or Production Planning (PP) modules when certain mandatory fields are not filled in during a transaction or process. This message indicates that the system has automatically filled in some key fields to allow the process to continue, but it may not be the desired behavior.
  Cause:
  
  Missing Mandatory Fields: The error usually arises when a user attempts to execute a transaction without filling in all the required fields. SAP has certain mandatory fields that must be populated for the transaction to proceed.
  Configuration Issues: Sometimes, the configuration settings in the system may require certain fields to be filled, and if they are not, the system will automatically fill them based on predefined rules.
  User Input Errors: Users may overlook entering necessary data or may not be aware of the mandatory fields required for the transaction.
  
  Solution:
  
  Identify Mandatory Fields: Review the transaction you are trying to execute and identify which fields are marked as mandatory. You can usually find this information in the field labels or by consulting the documentation for the specific transaction.
  Fill in Required Fields: Ensure that all mandatory fields are filled in correctly before executing the transaction. This may involve checking the data entry screen for any highlighted fields or error messages.
  Review Configuration: If you believe the automatic filling of fields is not appropriate, consult with your SAP administrator or functional consultant to review the configuration settings. They may need to adjust the settings to prevent automatic filling or to change which fields are mandatory.
  Training and Documentation: Provide training for users on the importance of filling in mandatory fields and how to identify them. Documentation can also help users understand the requirements for specific transactions.
  
  Related Information:
  
  Transaction Codes: The error may occur in various transaction codes related to inventory management, material master data, or production planning.
  SAP Notes: Check SAP Notes for any known issues or updates related to this error message. SAP frequently releases notes that address specific error messages and provide solutions or workarounds.
  User Forums: Consider visiting SAP community forums or user groups where similar issues may have been discussed. Other users may have encountered the same error and can provide insights or solutions.
  
  If the issue persists after following these steps, it may be beneficial to engage with SAP support for further assistance.