That was added in the last update forTMG Conversion to RM because there were some TMG users who relied on theTMG record numbers for various reasons.
The RM Reference number fact is a program defined fact and cannot be deleted within a database as user defined facts can be.
WARNING, this procedure is global and will delete all links to the fact.
In the RM database, you could go to Lists, Fact type lists and Edit the fact. Uncheck Exporting Gedcom files.
Create a new database and Drag and Drop one person into that database. Choose Everyone in the database on the Drag and Drop screen.
If you have changed the default fact sentence for the Principal and Witness in the old database, you will need to also make those changes for the sentences in the new database.
User defined fact default sentences transfers, Sharee role sentences except for Witness transfers, and customized sentences on rhe Edit screen transfers.
The new database would then become your main database.
If you do have other Reference numbers you want to keep, but still want to use the above procedure, you could create a Reports, List, Fact report.
In the Create a list of menu choose People with more rhan one of this fact.
Choose rhe Reference number fact.
Save the report to a rtf file if you have a word processor that supports Microsoft rtf files or a text file.
Open the file side by side with the new database in Windows.
Open the Edit person screen for a person and add the Reference number fact. Copy the Reference number you want in the report file and paste it into the fact description.