Knowledge Base

ACC: "Undefined Function in Expression" Error Message

Article ID: 123344

Article Last Modified on 1/19/2007

Microsoft Access 2.0 Standard Edition
Microsoft Access 95 Standard Edition
Microsoft Access 97 Standard Edition

This article was previously published under Q123344

Moderate: Requires basic macro, coding, and interoperability skills.

SYMPTOMS

When you call a user-defined function from within an aggregate (totals) function, such as the Sum() function, in a report, you may receive the following error message:

Undefined function '<function name>' in expression.

CAUSE

The user-defined function is located in the report module.

RESOLUTION

Transfer the user-defined function from the report module to a global module.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Access versions 2.0, 7.0, and 97.

MORE INFORMATION

Steps to Reproduce Problem

Open the sample database Northwind.mdb (or NWIND.MDB in Microsoft Access 2.0).
Open the Alphabetical List Of Products report in Design view.
Add a text box with the following property to both the detail section and the Product Name footer section of the report:
```
      ControlSource: =Sum(Notwork())
						
```
On the View menu, click Code.

Enter the following user-defined function in the report module:

      Function Notwork()
         Notwork=8
      End function

Close the report module.
Preview the report. Note that you receive the error message described earlier in this article.

REFERENCES

For more information about creating modules, search for "module," and then "Creating" using the Microsoft Access 97 Help index.

Keywords: kbbug kberrmsg KB123344