PROBLEM
In some instances, when using the Smart Editor widget to edit the attributes of features in the Web AppBuilder for ArcGIS application, the Save button is disabled and the following message is returned when clicking on the empty fields:
Warning: This value is required.
This is by design. When clicking on the empty fields, the warning message is returned because these fields are not nullable. This can be verified by viewing the hosted feature service from the REST endpoint in ArcGIS Online. The following image shows the non-nullable fields when viewing from the REST endpoint:
BuildingType(..., nullable: false, ...) LvlDmg(..., nullable: false,...)
To resolve this issue, change the field property to allow null values for the fields in ArcMap, and republish the hosted feature layer before adding it to the Web AppBuilder for ArcGIS application.
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