How to use a parameter field value as a substring in a "like" statement?

Hi all,
I'm trying to use a parameter field in a Record selection formula where the parameter field value would be a substring of the data stored in the field.
My parameter field (SlctResearcher) is constructed as follows:
Type: string
List of Values: static
Value Field: (Reports) RptAuthors
(in Value Options) Allow custom values?: True
{Reports.PubDate} in DateTime (2009, 04, 01, 00, 00, 00) to DateTime (2010, 03, 31, 23, 59, 59) and
{Reports.RptAuthors} like "*{?SlctResearcher}*"
When I hit F5 to generate the data, I get no results (and the parameter prompt field does not even come up...)
If I modify the formula to put a hard-coded string, like
"*Jones*"
after the 'like', I get results (all the reports where "Jones" is a substring in the RptAuthors string.) If I modify the formula to just use the parameter field without the quotes/stars like:
{Reports.PubDate} in DateTime (2009, 04, 01, 00, 00, 00) to DateTime (2010, 03, 31, 23, 59, 59) and
{Reports.RptAuthors} like {?SlctResearcher}
I do get the parameter prompt field, but still no results even if I put in a valid substring value (since it is not searching for a substring anymore...)
How can I do this?
Thanks,
Will

1st thing... Make a copy of your report before doing anything!!!
To use a SQL Command, you'll want to open the Database Expert and look at the Current Connections. Expand the data source and the 1st option you see is the Add Command option.
To find the SQL That CR is currently using, choose Database from the menu bar and select Show SQL Query...
You can copy this and paste it directly into the command window. (If you you can write your own SQL you don't need copy CR's, it's just an option.)
You'll also want to take not of any parameters that you have, you'll need to add them the the Parameter List of the command as well... be sure to spell them EXACTLY as they are in the design pane.
Anyway, once the SQL statement is in the Command window you'll be able to alter the WHERE clause to use the wild cards.
For future reference... What type of database are you reporting against???
Jason

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How to use a parameter field value as a substring in a "like" statement?

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