The issue is that once populated there is other text in that field.
so create a field for [Approval Status] with this formula
Trim(Right([Purchasing Review and Approval],"]"))
Here below are my own cheat notes on parsing fields set to Log Changes where the new entries are at the bottom.
Parsing Append Only Fields
so... if you have a text field set to Log Changes where the new entries act in the default manner which is to be at the bottom of the updates, here are some formuals to use to parse out the values from the most recent entry. I am also assuming that you are logging the date and not the date and time.
Most recent value (formula text field type)
Trim(Right([my update field],"]"))
Date of most recent update (this needs to be a formula date field)
ToDate(Left(Right([my update field],"["),9))
Who did the most recent update (formula text field type)
Trim(NotLeft(Left(Right([my update field],"["),"]"),9))
Parse out the date and time of the update
var text DateAndTime = Left(Right([append only with date /time],"["),18);
var date TheDate = ToDate(Left($DateAndTime," "));
var timeofday TheTime = ToTimeOfDay(NotLeft($DateAndTime,9));
ToTimestamp ($TheDate, $TheTime)
