I think, I'm following and understanding you better now. From your comments, I guess you can use PREVIOUS() to look back at not just the prior row (what I assumed) but group or other logical set. With that understanding in mind here is my answer. After, all the tables are joined together and the filter is applied for any given Division lets say Division 45 and cycle 17 you are looking at the privious row of that result set. Since, this filter with the previous() function is used in one script at a time when placed in the where clause in would simple be:

Where

Report level filter items

ws.StartDateTime IS NOT NULL and
wa.RetiredFlag = 0 and
wa.LoadStatusIndicator NOT IN (0, 4) and
msi.P4UtilityTypeReadIndicator != 'F' and

Expression level filter

if (
    {MeterSessionInput.P4UtilityTypeReadIndicator} = "L" and
    PREVIOUS ({MeterSessionInput.P4UtilityTypeReadIndicator}) = "E" and
    {Meter.MeterNumber} = PREVIOUS ({Meter.MeterNumber})
   ) then
(
  if ({MeterSessionOutput.ReadCode} <> 0 and
      {MeterSessionOutput.ReadCode} <> 2 and
      {MeterSessionOutput.ReadCode} <> 99 and
      {MeterSessionOutput.BestResultIndicator} = 2 and
      (isNull({CustomDataField_MeterLink.CustomData}) = true or
       IsDemo({CustomDataField_MeterLink.CustomData}) = false) )
     or
     (PREVIOUS({MeterSessionOutput.ReadCode}) <> 0 and
      PREVIOUS({MeterSessionOutput.ReadCode}) <> 2 and
      PREVIOUS({MeterSessionOutput.ReadCode}) <> 99 and
      PREVIOUS({MeterSessionOutput.BestResultIndicator}) = 2 and
      IsDemo(PREVIOUS({CustomDataField_MeterLink.CustomData})) = false) then
     true
)
;

So, the short & skinny answer is it simple looks at the previous row of the result set. I hope that, I'm clear.
  

to get previous you could add
ROW_NUMBER ( )
    OVER ( order by somefield ) as link

function to the query then create same query but with
ROW_NUMBER ( )
    OVER ( order by somefield )-1 as link
link them together using row_number and it should give you the previous.