Before you can use the Simple SCRUD option, the table, columns and identifiers for the Homes instance list have to be specified.
If you do not know what an instance list is, see What is an Instance List?
Switch to the Common Activities tab for Homes and click the option Select the columns to display and use for identification under Define how lists of [business object name] should be displayed:
Select xHomesForSale as the table to be associated with the business object, and add all the columns in the table except for xHomeImage to the list of columns to be displayed, and make xHomeId the instance list identifier:
Click Finish to save the instance list definition.