On my To Do Lists that I print out there is a letter with a number (A252) (B400). The letter always corresponds to the person's last name. All last names have the same number. So all Butler's are B400. If the last name is unknown, it prints (). I know it is not the RIN # or the MRIN number. I have RIN #s set to display in tools; file options. It also doesn't appear to be a familysearch ID or LDS number; I have those disabled. It only shows up for a person task and not a family task in the printed To Do List. So, I am thinking it is some family #. I only have 118 families but numbers go as high as 500. I can't find any information about it and I have not found a way to print without it. I haven't found it on any other reports either. Am I missing something? Sorry if this question has already been answered. I did a search and didn't find this exact situation.
Thank you for any help. It is not a big deal to leave it on, but I would like to know what it is and if it has any other uses.