Object Defaulting Rule Type - not populating a DFF field

Summary:

When a Job Offer is created, the DFF is expected to default the "position name" - "position code". However the field is not populated with the desired value.

Content (required):

Field Modification Rule Type - This works as expected. But does not meet the business requirements.

Object Validation Rule Type - This also works initially. But when we try to submit, an error message is displayed. (I will create a new question for this)

Version (include the version you are using, if applicable):

23A

Code Snippet (add any code snippets that support your topic, if applicable):