so if I'm following you the custom field you first created using other software right?
and you want it mapped to use within JRiver? You are then not seeing this field in a view? If you see it in a tagdump are you not seeing it in the tag window? Have you set the tag window to show the field? Have you included the field in a view or smartlist to show? and it's not showing up?
Normally what you have done is right. Although I'm not sure what you mean by creating "Recording Year" -- the field would have to be [ORIGYEAR]. However if you set this up as a date field externally (date fields are sort of funky) OR maybe you didn't and set the JRiver custom field to date (or it is but the other is not?)
a bit confused as what is not working , maybe you can give some more detail, thanks