I would say that this would be no different than having the same variable defined multiple times in a program.

example

TOTHRS = "first instance of TOTHRS"
TOTHRS = "second instance of TOTHRS"

The variable would assigned a different value each time that the line is executed with no problem. I don't think that this will cause an error when the report hits the second instance of the variable. But if you are expecting different values for each I would say you might have a problem if you are expecting different data or data types.

Elmer