If you make changes to the marketing list entity in Dynamics 365 v9 and try to move your customization, you may receive an error importing the customization.

Solution:

1. Extract the solution and open the customization XML file
2. Locate the List entity in the XML file
3. Add the following tag in the XML file:

<IsReadOnlyInMobileClient>1</IsReadOnlyInMobileClient>

4. Zip the solution and import it again