Sum of ROM (Days) Are Not Completed from Previous Month vs Current Month

“Original estimated hours” are not imported with the history by default.
Here is how to create a scripted field in Jira Data Center to retrieve original estimated hours history values for eazyBI

You can import this scripted field in eazyBI as a new numeric measure and use it in your formula.

If you use eazyBI for Jira Cloud, you can define the original estimated hours history field using this definition from eazyBI advanced settings, then import it as new measure from the import options page

[jira.customfield_or_est_h_hist]
name = "Original estimated hours history"
data_type = "decimal"
measure = true
multiple_dimensions = ["Time"]
javascript_code = '''
if (issue.changelog && issue.changelog.histories) {
  var ortimeEstimateHistory = [];
  for (var i=0; i < issue.changelog.histories.length; i++){
    var history = issue.changelog.histories[i];
    for (var a=0; a < history.items.length; a++) {
      var item = history.items[a];
      if (item.field == "timeoriginalestimate") {
        ortimeEstimateHistory.push(history.created.substring(0, 10) + ',' + parseInt(item.to?item.to:"0")/3600);
      }
    }
  }
 return ortimeEstimateHistory.join("\n");
}
'''

Martins / eazyBI