A family of Microsoft relational database management systems designed for ease of use.
stct80,
A few questions. Which version of Project are you using? What fields exactly did you customize and what is the exact formula you used ("Today" is not recognized in formulas, Current Date and Now are both okay but not Today)?
A technical nit but there are no tasks in the Resource Usage view, only resources and assignments.
I set up a sample file in Project 2010. I used the following formula in extra field Start1. (Note: in Project 2010 formulas in extra date fields (e.g. Date1) are inconsistent)
Start1=Now()+15
Then I created the custom filter below:
And/Or Field Name Test Value
% Work Complete is less than 100
And
Start is less than [Start1]
Or Baseline Start is less than [Start1}
When applied to my sample file, the filter selected two uncompleted assignments, one whose start date was within 15 days of today and the other whose baseline start date was within 15 days of today - exactly what you want, I think
John