Property Overwrites

What are property overwrites?

Sometimes, a property's settings should not apply to all of its assigned specifications. E.g. you might want to restrict the values of a property depending on the element, or use different Revit built-in parameters for different Revit categories.

To create overwrites, navigate to a specification for which you want to modify the property, click the edit button, and select Overwrite for this specification .

When you select Edit global property instead you will edit the general property and the changes will apply everywhere where the property has no other overwrites.

Overwrite Property Values & Rules

Rule overwrites can be added by adding additional rules via the Add Rule Override button. If existing rules need to be edited, you can overwrite them by clicking on the edit button next to them.

Overwrite Revit Mappings

Revit mappings are overwritten completely when the overwrite button is activated. This means that all fields from the base Revit mapping will be overwritten, whether the fields are empty or not.

Common use cases for Property Overwrites

Property values are the most common function of property overwrites. Use them to narrow down values based on the matching classifications.

• Restrict values to a relevant subset for the current specification
  e.g. Limit material options based on the element type

• Force a single predefined value
  e.g. Assign a specific uniclass code for a given specification

• Apply custom value rules (e.g. Regex) per specification
  e.g. Use different validation rules for system codes across specifications