Guide to handle BIR issues

• as much as possible avoid doing datafix but you can proceed given the following
  • Do not datafix anything if BIR already has a copy of the reading and/or receipts 
  • any data can be updated  if they already after the last reading and ejournal that's submitted to the BIR 
  • any datafix should be approved first
• Sales should start (#001) on the effectivity date of the PTU or later
• POSD settings should be correct
• OR# and grand totals in readings should always be continuous