Report for last date of an activity

Question

I'm running Crystal Server / Designer 2008 in conjunction with SAP Business One.  I'm trying to create a report that will list all of my customers that have not been seen in the past 90 days.  I have two tables that this report needs to be generated from for this.  The first is the customer table.  The second is the customer activity table.  My problem lies in two areas.  Anytime I set an activity type I'm searching for and there is not one it eliminates the customer from the list.  The second has to query the date and if there hasn't been someone to see the customer in more than 90 days it eliminates them there too.  Below are a few examples of what I'm trying to explain.
Customer A
No Activities in second table
Customer dropped from list
Customer B
No Activities of the type I'm looking for
Customer dropped from list
Customer C
Activities present but more than 90 days old
Customer dropped from list
Customer D
Activities less than 90 days old
Customer stays on list but need to hide it since they have been there oin the past 90 days.
To try to summarize I want to create a report of the cautioners our sales team have not been to see in the past 90 days.
Any direction would be appreciated.
Thanks,
Thomas

Answer 1

Something that might make Jason's #4 step easier to swallow:  Leave the tables there, save the changes in the database expert, then modify all of the formula fields, summaries, etc. to use the fields from the command instead of the tables.  The Field Explorer will not show a green checkmark on the table fields once they have all been changed.  Then go back into the database expert and drop the tables.
You will find that by doing it this way, much of your formatting, etc, can be preserved.  Virtually every instance of a table field use can be replaced by the command field's use without effecting any formatting changes.  (Fields directly on the report, and the number of decimals on summary fields are the only two places where I noticed format info was not retained.)
Some hints:  Summary fields on the report can be changed by right-clicking on the field and selecting Change Summary.  Change the field being summarized in the pop-up.  Groups can have the field changed by going into the Group Expert, selecting the field in the Group By: pane, pressing the Options button, and changing the referenced field.  This will keep all of the group formats and their fields and formulas (like suppression).  The formula fields are easily changed by pressing Control-F (Find) and doing a Find and Replace to substitute field names.  Lastly, if the SQL Command field names are the same as the table field names, you only have to change the "table qualifier" in all of your formulas, which can change several different field references with on Find and Replace.  (I just had to switch about a dozen reports from using Stored Procedures to using SQL Commands - which Crystal doesn't like to handle with the Change Data Source Location functionality - using this technique, and it took me less than an hour per report.  And the reports weren't trivial...)
HTH,
Carl