How To Fix AD210 - You may not define more than two key fields

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 210

• Message text: You may not define more than two key fields

What causes this issue?

You changed the system proposal for the fields of a physical pool, but
a physical pool has a fixed structure.
A pool must have exactly two key fields with the names TABNAME (for the
name of the logical pooled table) and VARKEY (the key fields of the
logical pooled table are stored as a string here).

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?

Set the definition of the physical pool back to the proposed structure.
You have to delete the key field which you inserted.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD210 - You may not define more than two key fields ?

  The SAP error message AD210, which states "You may not define more than two key fields," typically occurs when you are trying to define a data structure or a database table with more than two key fields in a context where only two are allowed. This restriction is often seen in certain SAP applications or configurations, particularly in the context of data modeling or when defining certain types of database tables.
  Cause:
  
  Exceeding Key Field Limit: The primary cause of this error is that you are attempting to define a table or structure with more than two key fields. In some SAP contexts, such as certain types of database tables or data models, there is a limitation on the number of key fields that can be defined.
  Incorrect Configuration: The error may also arise from incorrect configuration settings or misunderstandings about the requirements for the specific data structure you are working with.
  
  Solution:
  
  Review Key Field Definition: Check the definition of the table or structure you are trying to create or modify. Ensure that you are only defining up to two key fields. If you have more than two, you will need to reconsider your design.
  Reassess Data Model: If your data model requires more than two key fields, consider whether you can achieve your goals with a different design approach. For example, you might be able to use a composite key or rethink how you structure your data.
  Consult Documentation: Refer to SAP documentation or guidelines specific to the module or application you are working with. This can provide insights into the limitations and best practices for defining key fields.
  Seek Help from SAP Community: If you are unsure how to proceed, consider reaching out to the SAP community forums or consulting with an SAP expert who can provide guidance based on your specific scenario.
  
  Related Information:
  
  Key Fields: In SAP, key fields are used to uniquely identify records in a database table. They are crucial for ensuring data integrity and efficient data retrieval.
  Composite Keys: If you need to represent a unique combination of more than two fields, consider using a composite key approach, where you combine two key fields with additional non-key fields to achieve uniqueness.
  SAP Data Dictionary: Familiarize yourself with the SAP Data Dictionary (SE11) to understand how to define tables, structures, and their key fields properly.
  
  By following these steps, you should be able to resolve the AD210 error and successfully define your data structure within the constraints of SAP.