Crystal Reports Fields not found in result set

Message

   I have a report using a SQL stored procedure joined with two tables and then two sub reports.  One subreport uses another SQL stored procedure.

It seems that when I reach a certain record, I receive the message 

"One or more fields could not be found in the result set.  Use Verify Database to update the report."

I have verified the database and it returns "Databse is up to date"

All pages of the report prior to this particular record display fine.

I can execute the stored procedure with the same parameter value in SQL Query Analyzer and the result set has all necessary fields.

Solutions, ideas, guesses?

n8