Infamous errors while posting Payrresults to FI-CO

there are some errors like Posting balance is not cleared (Period 01),these are errors that HR consultant may have to fix,others error like below FI consultant interference may be necessary like error during import of payresults he also recently came across a strange error "person not assigned ..),he isnt able to recollect the error,but please watch this space for snapshot.This was due to Vendor name made mandatory in G/l and hence it was throwing that error. period not open for account type and G/L account requires an assignment to CO object