Block Updates to a Field in Marketo

  • Updated


When a form has multiple sources of data, the data from one source may overwrite another. For example, Marketo's Munchkin API can overwrite data. If you'd like to keep the initial data, Marketo allows you to block updates to non-empty fields. The block action can also be narrowed by source.

Important: The information in this article is from Marketo's documentation. For more information, see Marketo's Product Docs.


  1. Settings. In Marketo, go to Admin and click Field Management.

  2. Block Field Updates. Find the field, select it, then, under Field Actions, click Block Field Updates.

  3. Select Sources. Select the Input Sources you want to block and click Apply.


Marketo blocks updates to existing, non-empty fields. Empty fields continue to be updated on first change.

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