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devir606357
February 10, 2026
Question

Step-by-Step #10: Reusable interface Expression Error (Column Layout vs Form Layout)

  • February 10, 2026
  • 10 replies
  • 0 views

Hi,

I am using Community Edition and  following the Appian Developer path. In for Step-By-Step # 10 I am getting expression error while adding the reusable component on a interface/form. 

I followed all the steps till this section and all works good. As per Step by Step #10, Guide I am trying to complete the following steps.

as soon as I click ok, above expression error message displayed. 

Any suggestions to fix this ? 

    10 replies

    mikes0011
    mikes0011
    Brainy
    February 10, 2026

    As is implied by the error message, a Form Layout component cannot be nested under any other component.  It seems like your "Vehicle Details View" interface has a FormLayout in it, yet you're trying to add it to a column.

    D
    devir606357Author
    February 10, 2026

    Thanks Mike for quick reply. 

    Yes I got that point (as mentioned in subject that its form layout vs Column (not supporting). However, since the reusable 'Vehicle Details VIew' interface was created as per the instructions from the previous step by Step exercise and in this Step by Step10, following the same template as suggest in the guide. Now struggling on how to fix it ? Do I select a different form template OR do I got back to reusable component/ (i.e.  "Vehicle Details View" interface to change it to change ---still learning if I can do that but assuming that could be a option)

    harshas2775
    harshas2775
    February 11, 2026

    Can you check and share the code you have in the vehicle details interface. If its a reusable interface it should not have the formLayout() in it

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