Hello Mike and sorry for the delay in reverting to you.
>> You mention "2409 individuals and 932 families".
>> I think you are looking at the lower left border of the main FH window.
>> That always lists the number of Individual records and Family records, but is nothing to do with the number of Note records.
In FH, the "2409 individuals and 932 families" is showing in the bottom right-hand corner of my screen, just above the time and date etc in the W10 system tray
>> To obtain a list of the numbers of all types of records use the File > File Statistics... command.
OK, here goes :-
Item; Count
Individual Records; 2,409
Family Records; 932
Facts; 9,620
Witnesses (links); 0
Witnesses (name only); 0
Note Records; 530
Source Records; 0
Citations; 0
Repository Records; 0
Submitter Records; 0
Submission Records; 0
Media Records; 0
Media Links; 0
Place Records; 2,114
Research Notes; 0
Source Template Records; 0
>> Open the Records Window, which has tabs Individuals, Families, Notes, Sources, Repositories, Media, etc, etc.
>> Open the Individuals tab and their Record Id are listed in the 2nd column but without the I letter prefix.
>> Open the Notes tab and their Record Id are listed in the 2nd column but without the N letter prefix.
>> All the other tabs are similar each with its own Record Id list. The same numbers can appear in each list but are unrelated.
>> With this new knowledge, is there any correspondence between Notes tab Record Id and the UDF @N123@ numbers?
>> There may be no correspondence. I am just looking for clues to how Generations has formatted its GEDCOM.
I cannot readily see a correspondence.
>> Another line of investigation is indicated by your earlier UDF list screenshot.
>> Many of those UDF Items involve such as @N365@ and the Item Data Reference INDI.HIST
>> That suggests an Individual History fact associated with a Note record with Record Id 365.
>> The All tab for William Francis Rowland GREENWOOD [Record Id 49] shows that HIST @N365@ item at the bottom.
>> Does that correspond to some form of History fact with a Note in Generations?
William Francis Rowland GREENWOOD is Person ID 49 on Generations and Record Id 49 on the "Individuals" tab on FH. The penultimate line of his Individual Record on FH says HIST @N365@. If I go to the Notes tab and access Record ID 365, the text - which is not on his FH Individuals record - is that which appears in the Research field of the Notes tab on Generations.
However, there are further notes in Generation which I cannot see in FH. These feature on the "Facts" tab on Generations, and are added facts for "Minister at baptism", "Witness at wedding" and "Banns". Interestingly, the name of one of the witnesses has a typo in it - "Eliozabeth". Hence, I searched for "Eliozabeth" Using Edit/Find in FH. That name could not be found in the Notes tab of the Records window in FH, and also does not feature in the Result Set tab in the UDF window in FH.
>> Anyway, try running the plugin Generations Post Edit and its variant Generations - Post Edit.
>> Then investigate whether the UDF List plugin produces a shorter list.
You have lost me there. I have taken my five Plugins from the "Import from Generations Family Tree" at the bottom of
https://fhug.org.uk/kb/kb-article/impor ... historian/. Hence, I am unsure which of these two Plugins I have got, and how I should obtain the other. Running the one that I have got does not reduce the UDF "Records in Result Set" from 1173 items.
>> Many of those UDF Items involve such as @N365@ and the Item Data Reference INDI.HIST
>> That suggests an Individual History fact associated with a Note record with Record Id 365.
In the UDF Result Set, some entries in the UDF item column are @1234@ ; some are dates ; and some are text. This screenshot includes examples of each :-

- Capture1.JPG (226.62 KiB) Viewed 2365 times
What do you suggest that we do next ? You did mention a workaround on the INDI.HIST @N321@ UDF scenario, so are we at that stage yet ?
Many thanks for all of your help.
Paul