Block Updates to a Field in Marketo

Context

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.

Steps

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

Outcome

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

Next Steps

This was taken from the Marketo documentation and further information can be found there.