Access Building a IIF expression in Access


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I have a expression in my data base that adds 7 days to a date if a field contains specific information. The expression works great. On another field I'm trying to build a similar expression and can not get it to work.

This is the expression that works for adding 7 day to a date

IIF(IsNull([BatchLot]),"",DateAdd("d",+7,[SampleDate]))

No I want the expression to be able to say that if the BatchLot field and the ConcreteAge field are null then do nothing. If the BatchLot field contains something and the ConcreteAge field has a value I want to add the value of the ConcreteAge field to the SampleDate. In other words if the ConcreteAge field says 3 then I want to add 3 days to the date if it says 10 then I want to add 10 days. I have written the following expression but seem to be missing something.

IIF(IsNull([BatchLot]) and (IsNull([Concrete Age Day]),"",DateAdd("d",+([ConcreteAgeDay]),[SampleDate]))

Can anyone help?????
 
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