It's a new year and you just closed 2008 in Great Plains. You run FRx for the first period of the year and use /BB and @PERDESC header. The report will run without error but you're getting this - Period not found in Company Calendar, as the column header.
So what do you do? Download Microsoft FRx 6.7 Service Pack 10. Here are the links to download the file:
For GP Partners download here.
For GP Customers download here.