I know it is not supposed to be possible but I may have found a work around by placing the fields in a block with attributes. This way double clicking the block opens the attributes for editing and ignores the fields.
My problem is I can get one field (dwg number) to update on a regen using CTAB, however the other field that is supposed to return the job number only returns the attribute default value.
If someone knows of a solution I am all ears.
john