Thanks a lot for your information.

The simple addition worked fine, howerver the date manipulation did not
even though things looked right.
I made the addition at the SQL server statement level and things are
working ok now. One day when I'll have more time I'll check again how to
make that date adding script work

Thanks again !

Doug Robbins - Word MVP wrote:
Adding a number to a numeric field is quite simple using the following field
construction

{ = 10 + { MERGEFIELD Number } }

Adding to dates is a bit more complex because you may exceed the number of
months in a year. As a result, you need the following field construction

{ IF { = 10 + { MERGEFIELD Date \@ "MM } } 13 "{ = 10 + { MERGEFIELD Date
\@ "MM" } }/{ MERGEFIELD Date \@ "dd" }/{ MERGEFIELD Date \@ "yyyy" }" "{ =
10 + { MERGEFIELD Date \@ "MM" } - 12 }/{ MERGEFIELD Date \@ "dd" }/{ = 1 +
{ MERGEFIELD Date \@ "yyyy" }}" }

You must use Ctrl+F9 to insert each pair of field delimiters { }.

For a wealth of information on date field calculations in Word, see:

http://www.wopr.com/cgi-bin/w3t/show...?Number=249902