Can't import or export Int Field

We have two Int fields for my Doctype that were added after originally saving the Doctype. The data for these two fields can be entered, saved and seen on re-opening. However, the data for these two fields/columns will not export. More importantly we cannot import the data for these two columns. After several tries I tried modifying the .json file to add additional attributes which appear to be with other fields but that did not resolve the import or export problem.