"Match not found, reset to original" Error for Reference Field to Remote Table

[Peter6]

I have a remote table that I'm using as a reference in another form, Releases. When I try to save a Releases record I get the error "Match not found, reset to original".

The lookup appears to work properly while selecting a value

However when I pick an entry the preview fails, which suggests to me the linkage to the remote table is failing.

My remote table exists and entries have a sys_id, I had a problem earlier where I failed to populate the sys_id

[Peter6]

I found the issue, the hyphen in the sys_id was causing the record to not be found. I stripped them out and it works now.