How To Fix /UI5/MP_CA012 - Property to insert already exists in base descriptor: &1

SAP Error Message - Details

• Message type: E = Error

• Message class: /UI5/MP_CA -

• Message number: 012

• Message text: Property to insert already exists in base descriptor: &1

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /UI5/MP_CA012 - Property to insert already exists in base descriptor: &1 ?

  The SAP error message /UI5/MP_CA012 Property to insert already exists in base descriptor: &1 typically occurs in the context of SAPUI5 or Fiori application development. This error indicates that there is an attempt to add a property to a UI5 component or descriptor that already exists in the base descriptor. 
  Cause:
  
  
  Duplicate Property Definition: The most common cause of this error is that a property is being defined in a UI5 component or controller that has already been defined in a parent or base descriptor. This can happen if you are trying to extend a UI5 control or component and inadvertently redefine a property that is already present.
  
  
  Inheritance Issues: If you are using inheritance in your UI5 application, the child component may be trying to add a property that is already defined in the parent component.
  
  
  Configuration Errors: There may be configuration issues in the manifest file or in the component.js file where properties are defined.
  
  
  Solution:
  
  
  Check Property Definitions: Review the properties defined in your component or control. Ensure that you are not redefining properties that already exist in the base descriptor. If you need to modify the behavior of an existing property, consider overriding the relevant methods instead of redefining the property.
  
  
  Use Inheritance Properly: If you are extending a UI5 control, make sure to use the extend method correctly and only add new properties that do not conflict with existing ones.
  
  
  Review the Manifest and Component Files: Check your manifest.json and Component.js files for any duplicate property definitions. Ensure that properties are defined only once and are correctly inherited.
  
  
  Debugging: Use debugging tools to trace where the property is being defined and to identify the source of the conflict. This can help you pinpoint the exact location in your code where the duplicate definition is occurring.
  
  
  Consult Documentation: Refer to the SAPUI5 documentation for guidelines on extending controls and components. This can provide insights into best practices and help avoid common pitfalls.
  
  
  Related Information:
  
  SAPUI5 Documentation: The official SAPUI5 documentation provides detailed information on component lifecycle, property definitions, and best practices for extending controls.
  SAP Community: Engaging with the SAP Community can provide additional insights and solutions from other developers who may have encountered similar issues.
  Version Compatibility: Ensure that you are using compatible versions of SAPUI5 libraries, as discrepancies can sometimes lead to unexpected behavior.
  
  By following these steps, you should be able to resolve the error and ensure that your UI5 application functions as intended.