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#error in switch function

Experts. I have a pretty complex query in our Access database. It displays the income guidelines for our apartment buildings. I used to use nested iif statements but there got to be too many different income limit percentages so I have to change my equations to the switch function.

Everything works/displays fine but we have 'previous year' buttons that display the limits from the past. When I click this button to go to a previous year and then close that screen to go back to the current year all my textboxes (which house the results from the switch function) turn to #error.

I have tried:
1. closing all these income limits screens and re-opening fresh thinking the same table is opening in both record sources and it doesn't like that but that didn't change anything.
2. also renamed text boxes on the screen to make sure they didn't match the actual field name. That didn't change anything.

I can attach the actual database if need be, it will just take some time. Please let me know if that would be helpful. Attached are some screen shots of the database and a text document with a snippet of the SQL.
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1 Solution
Switch evaluates all of the expressions, even though it returns only one of them. For this reason, you should watch for undesirable side effects. For example, if the evaluation of any expression results in a division by zero error, an error occurs.
acramer_dominiumAuthor Commented:
Ok. That makes sense. There will be only one of those expression that returns a 'true'. Why does it work on the first viewing of the screen though and then error out after you open another screen and go back to it?
It looks like
data returned might be null (when it is not working) because I see error in all of them.

I do not have MS Access and not an expert.

Is there a way for you to run the application in the DEBUG mode?

then just before you try to get to the screen where error shows up, put a breakfront in the code (on the SWITCH statement).  Inspect values.

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acramer_dominiumAuthor Commented:
The SQL is all in a query there's no debugging that can be done. The data returned is not null there is a dollar amount that the statement returns.
Patrick MatthewsCommented:
Ashok is correct that Switch will evaluate all the expressions, and not just stop when it finds the first true condition.  For more about Switch: http://www.experts-exchange.com/Microsoft/Development/MS_Access/A_3556-Using-the-Switch-Function-in-Microsoft-Access.html

To really troubleshoot this we will need a copy of the DB.
acramer_dominiumAuthor Commented:
Looking for another alternative
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