Function security is the mechanism by which user access to applications functionality is controlled.
Function security can be considered as “global data security”, in that it grants access to a function regardless of the current row of data. Oracle Applications architecture aggregates several related business functions into a single form. Because all users should not have access to every business function in a form, Oracle Applications provides the ability to identify pieces of  applications logic as functions. When part of an application’s functionality is identified as a function, it can be secured (i.e., included or excluded from a responsibility).
Application developers register functions when they develop forms. A System Administrator administers function security by creating responsibilities that include or exclude particular functions.
A function is a part of an application’s functionality that is registered under a unique name for the purpose of assigning it to, or excluding it from, a responsibility. There are two types of functions: executable functions (formerly called form functions), and non-executable functions (formerly called subfunctions).
Executable Function
Executable functions have the unique property that you may navigate to them using the Navigate window.

Non-executable Function

A non-executable function) is a securable subset of a form’s functionality: in other words, a function executed from within a form.
A developer can write a form to test the availability of a particular non-executable function, and then take some action based on whether the non-executable function is available in the current responsibility.
Non-executable functions are frequently associated with buttons or other graphical elements on forms. For example, when a non-executable function is enabled, the corresponding button is enabled.
However, a non-executable function may be tested and executed at any time during a form’s operation, and it need not have an explicit user interface impact. For example, if a non-executable function corresponds to a form procedure not associated with a graphical element, its availability is not obvious to the form’s user.
A menu is a hierarchical arrangement of functions and menus of functions. Each responsibility has a menu assigned to it.
Menus can map to permission sets as well.
Menu Entry
A menu entry is a menu component that identifies a function or a menu of functions. In some cases, both a function and a menu of functions correspond to the same menu entry. For example, both a form and its menu of subfunctions can occupy the same menu entry
A responsibility defines an application user’s current privileges while working with Oracle Applications. When an application user signs on, they select a responsibility that grants certain privileges, specifically:

  • The functions that the user may access. Functions are determined by the menu assigned to the responsibility.
  • The concurrent programs, such as reports, that the user may run.
  • The application database accounts that forms, concurrent programs, and reports connect to.
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