Expression Builder doesn't display database's user-defined functions in the Functions node

Original KB number:   981241

Consider the following scenario:

• You open a Microsoft Access database in Disabled mode.
• You open the Expression Builder in a context that enables user-defined functions.
• In the Expression Builder's Expression Elements tree view, you expand the Functions node.

In this scenario, the database's Microsoft Visual Basic for Applications (VBA) project is not listed under the Functions node.

This is by design. This issue occurs because, when the database is opened in Disabled mode, VBA cannot enumerate any of the arguments that are defined for user-defined functions. To enumerate these arguments, VBA must be able to compile the type libraries of the modules that contain the user-defined functions. When the database is in Disabled mode, VBA cannot compile these modules. Therefore, the Expression Builder cannot display the user-defined functions for the database.

To work around this issue, you can trust the database and stop Disabled mode as follows:

• Use the Message Bar: Select Enable Content on the Message Bar. When you choose this option, you may need to repeat the procedure if the database changes.
• Trust the database permanently: Place the database in a trusted location (a folder on a drive or network that you mark as trusted). When you choose this option, you no longer see the Message Bar, and you never have to enable the database content as long as the database remains in the trusted location.