If your application includes the following commands, it will return the error “Feature not available.” Although you cannot include commands that create or modify menus, forms, or queries, you can run compiled menu, form, or query programs in your application.

Unavailable commands
BUILD APP MODIFY FORM
BUILD EXE MODIFY MENU
BUILD PROJECT MODIFY PROCEDURE
COMPILE MODIFY PROJECT
CREATE FORM MODIFY QUERY
CREATE MENU MODIFY SCREEN
CREATE QUERY MODIFY STRUCTURE
CREATE SCREEN MODIFY VIEW
CREATE VIEW SUSPEND
MODIFY CONNECTION SET STEP
MODIFY DATABASE
(с) хельп