Hi Cheryl,

As you observed and Ben confirmed, the XML file with the field definition is used as a template when a new assay design is created. Later changes to the XML file do not change the existing assay designs.

Without using a custom module like Ben described, to change the property type, I think you would need to:

1. Temporarily remove the field from the XML file.
2. Rename or delete the existing field.
3. Create a new field of the desired type.
4. Re-introduce the field from the XML file with the desired type.

Without #1, as you've probably seen, the server won't let you edit or remove the existing field.

Thanks,
Josh