# Options

![Set field value to a constant](/files/3T11I3b2lMA3u2cKKicu)

You can specify what fields to replace with the **Fields** table. Click **Get Fields** to populate the table with input from the PDI data stream. The table contains the following columns:

| Column                     | Description                                                                                                                                                                                                                                          |
| -------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Field**                  | Specify the field that contains the value you want to replace.                                                                                                                                                                                       |
| **Replace by value**       | Specify the value that will replace the original field value specified.                                                                                                                                                                              |
| **Conversion mask (Date)** | Specify a date format for the replaced field. See [Common Formats](/pdia-data-integration/9.3-data-integration/pdi-transformation-steps-reference-overview/common-formats.md) for information on common valid date formats you can use in this step. |
| **Set empty string?**      | Specify **Y** to allow an empty string when the value is empty; otherwise, a null value is used.                                                                                                                                                     |


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