# Options

![Set field value to a constant](https://3411831820-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FAYwCj9fPr1B2pjC11IOQ%2Fuploads%2Fgit-blob-7690e961f3f3f91b1abd70c71039e55728af4776%2FPDI_SetFieldValueConstant_Options.png?alt=media)

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](https://docs.pentaho.com/pdia-data-integration/9.3-data-integration/pdi-transformation-steps-reference-overview/common-formats) 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.                                                                                                                                                                          |