Trying to prevent Duplicate Data Inputs

rhounsome

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I have a form that contains 5 fields and want to ensure that duplicate information is not entered. I am aware that when creating the form you can set Duplicate Records to No but each record has an AutoID which I assume means that even if the information is the same it will not register as a duplicate record due to the different AutoID.

There should only ever be 5 records entered per day. One for each region

I have created a Sanity Check that is displayed as a sub form that shows if the relevant information has been entered for a given day in Bookings and Backlog but this doesn't stop the user from putting in the same information twice. i.e. the User starts inputting the information gets called away and then trys to put it in again but doesn't check the sub form.

The Table in which the information is stored is called Bookings and Backlog.

The 5 fields on the form which is called Bookings and backlog are

ID (Autonumber)
Date (Short Date)
Combo26 (Text) (5 Regions:- North, South, East, West, Central)
Bookings (Number)
Backlog (Number)

I have put the following statement in AfterUpdate on the Combo26 field

If Me.Date = DLookup("[Bookings and backlog]![Date]", "[Bookings and backlog]", "[Bookings and backlog]![Date]=[Date]") And Me.Region = DLookup("[Bookings and backlog]![Region]", "[Bookings and backlog]", "[Bookings and backlog]![Region]=[Combo26]") Then
'Define Message Box
MsgBox "The Region you have chosen already has data entered for this day." & vbCrLf & vbCrLf & "Please check your records and amend were neccessary.", vbCritical, "USER INPUT ERROR"
Else
End If

However I'm not to hot with writing VBA and probably got something wrong somewhere as it doesn't seem to do anything and lets the user progress regardless. I have tried amending the above script and asked it to look at just one field but this just seems to give the message regardless of the information selected in the Combo box.

Can someone give me an indication as to what I have done wrong so I can put it right and in a language that is easy to understand so that if I have a similar issue later on I don't need to post another question.
 
:p Hello rhounsome!
Make one INDEX (with UNIQUE = Yes),
with these 4 fields (Date, Combo26, bookings, Backlog).
 
Excuse me for my lack of knowledge but what is an INDEX. You are talking to a very Green(NOVICE) Access Programmer. :confused:
 
:) Look at "DemoIndexA97.mdb".
Open Table2 in design view,
click on the icon "Indexes",
look at "Index1".
Make same for your table.
 

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