How To Fix MC071 - Field &-& required as a key field

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 071

• Message text: Field &-& required as a key field

What causes this issue?

You tried to delete a mandatory field.
Certain views and matchcode objects must contain at least all the
primary key fields of the included tables which are not simultaneously
foreign key fields.

System Response

You cannot delete the field.

How to fix this error?

Leave the mandatory fields in the view or matchcode object.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC071 - Field &-& required as a key field ?

  The SAP error message MC071 ("Field &-& required as a key field") typically occurs in the context of Material Management (MM) or Production Planning (PP) modules when a required key field is missing in a transaction or data entry process. This error indicates that the system expects certain key fields to be filled in order to proceed with the operation, such as creating or updating a record.
  Cause:
  
  Missing Key Fields: The most common cause of this error is that one or more required key fields are not filled in the transaction screen. Key fields are essential for uniquely identifying records in the database.
  Configuration Issues: There may be configuration settings in the SAP system that define which fields are required for certain transactions, and these settings may not align with the data being entered.
  Data Entry Errors: Users may inadvertently skip fields or enter incorrect data types, leading to the system not recognizing the input as valid.
  
  Solution:
  
  Check Required Fields: Review the transaction screen to ensure that all required fields (key fields) are filled in. Look for any fields marked with an asterisk (*) or highlighted in some way.
  Review Configuration: If you have access, check the configuration settings in the relevant module (e.g., MM or PP) to see if there are any changes that need to be made regarding required fields.
  Consult Documentation: Refer to SAP documentation or help files for the specific transaction you are working with to understand which fields are required.
  User Training: Ensure that users are trained on the importance of filling in all required fields and understand the implications of missing data.
  Debugging: If the issue persists, consider using transaction codes like SE80 or SE37 to debug the program or function module that is generating the error. This may require assistance from a technical consultant.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with the transaction codes related to the module you are working in (e.g., MM01 for material creation, CO01 for production order creation).
  SAP Notes: Check SAP Notes for any known issues or patches related to the error message MC071.
  Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  By ensuring that all required fields are filled and understanding the configuration settings, you can typically resolve the MC071 error effectively.