When exporting a structure to a project, you may encounter errors referencing the “mandatory” attribute in multiple tables and fields, see the example below:


{
 "messages": [
   {
    "message": "No more supported 'mandatory' attribute in project found on field 'UUID' of table 'Table_1'. Please use instead 'Reject NULL value input' (or 'Map NULL values to blank values')",

    "severity": "error"
   },
   {
    "message": "No more supported 'mandatory' attribute in project found on field 'Name' of table 'Table_1'. Please use instead 'Reject NULL value input' (or 'Map NULL values to blank values')",

    "severity": "error"
   }
],
 "success": false
}


These messages indicate that the ‘mandatory’ attribute is no longer supported in your project. Here's a quick fix:

1. Identify the problematic fields:
   In the example above ‘UUID’ and ‘Name’ fields in the ‘Table_1’ table


2. Adjust field settings from the field inspector:
   • Uncheck the "Mandatory" Option: Disable the mandatory setting for the affected fields.
   • Enable NULL Value Handling: Check one of these options to manage NULL values:
   • "Refuse NULL Values"
   • "Translate NULLs to Empty Strings"
   
   
3. Re-export your structure:
   After applying these changes, try exporting your structure again. The process should now complete without error.