Passing the value from one table to a table

Coming back after a long time I am missing some of the mechanics. When I add a new record to a different table, I am not able to select values from the sending “page/table” I see only:

What am I missing?? Thx Robert

When adding a record to a different table, a ‘Relation’ column is required.

Yes I have a relationship but still do not see any of the “sending table” fields.