I have a combo box on a form. When I click the arrow button I get a popup saying "Enter Parameter Value" in the blue title bar and below the title says Outage.ID. (Outage is the name of the table I get my values from). Below that is a spot to enter data and "OK" and "Cancel" buttons. When I click "OK" the drop down list for the combo box appears, correctly displaying the values from the table. However, when I clcik on a value it does not populate into the combo box area. I cannot even manually type in the value I want. What is going on here?
Your problem can have various causes - here are a few.
Make sure your combobox is bound to the correct field and that field is not an autonumber or not locked.
Make sure the data source for the form is editable - if you use grouping in a query and then use the query as the data source then you can't edit the data.
Make sure the form is open for data entry and not read-only.