There are Grid layouts in the Modern UX where attachment attributes can be displayed. However, if these attributes are marked as "value required" we see that new instances cannot be created in the Grid.
Steps to Reproduce the Issue are as below:
Expected Result: Attachments get uploaded and that a new row is created in the Grid
Actual Result: When an attachment is uploaded the following error message is thrown.
API-1019 : Could not process the request due to internal error.
Following error gets logged in the app-ca.log:
ERROR 2021-08-25 07:20:18,094 [http-nio-8080-exec-38] ppm.rest (clarity:admin:17920042__DCF65C64-EBD-8DB8-6765D0ACC125:PPM_REST_API) Exception processing request for resource [attachments], query string [/virtual/attachments]
java.lang.NumberFormatException: For input string: "undefined"
This is caused due to a defect with ID DE62315.
The defect is not going to be fixed. This behaviour has been documented as a Known Issue as of version 15.9.3.