You need the text in $$QuestionTextField to be in the form: TableOccurrenceName::FieldName. Your variable has "A001" for the "Field name" part of the field reference but you also need the table occurrence name. If the text in this variable were something like: "MyTable::A001" where MyTable is the name of one of the "boxes" in Manage | Database | Relationships, then you could use this script step:
Set Field By Name [$$QuestionTextField ; $$QuestionValue.]
Perfect! I just couldn't get the syntax.
Thank you. It worked perfectly!