specify 'no tabbing' through specific fields in a table?

We have a table where users like to ‘tab’ their way through the fields as they complete information in the table. One of the fields in each row is automatically populated (using a custom field renderer) with a value from the prior row in the table: In the image above the value highlighted in blue is populated from the previous row. As users tab through the highlighted field and into the next one, the pre-populated value is lost. Is there a way to disable this particular field from being ‘tabbed into’? eg a tabIndex property? in the image above, a user should be able to tab straight from 2130 into the empty reference field on the right.