@Chaminda Batuwangala did you check to see if similar questions have been asked on the Pega Support Center? 

You can use a key word search. 

I found this question , perhaps that helps you?

Does this issue occur when you *import* the PDF into Pega  (Creating a new application from a Blueprint), or whilst you are running the Blueprint mechanism itself?

If this is occurring during the Blueprint creation, can you confirm that you already used the Contact Pega’s Blueprint Team form on the Blueprint FAQ page?

 @BrianPageau do you recognize the issue above?

⚠ Below is a GenAI-powered tool. All generated answers require validation against the provided references.

To address the issue of Pega Blueprint data model deleting the new fields that you add manually, it's important to ensure that the data model is properly configured and saved before moving to the summary stage or creating a PDF or Pega blueprint file.

When creating a data model, it's crucial to follow best practices and ensure that all necessary fields are added and saved correctly. Additionally, it's important to verify that the data model is properly configured and saved before proceeding to the summary stage or creating a PDF or Pega blueprint file.

For more detailed troubleshooting steps and best practices, you can refer to the "Creating a Data object with AI" documentation in the Pega Platform documentation.

This resource provides comprehensive guidance on creating and configuring data objects, including the necessary steps to ensure that new fields are not deleted when moving to the summary stage or creating PDF or Pega blueprint files.