A/R Year End error messages

I am trying to process year end in AR.  I have ran/printed all customer statements, interest, printed all posting journals and reports needed.  Every batch is posted to the GL and backed up. Every time I click "Process" in Year end I keep getting the error message "There are outstanding billing cycles to process. Continue?"   There are no billing cycles to process to my knowledge.  Am I missing a step?  Please help!