Base table columns not appearing in Key and Cross Domain Ana

[harshada]

I am trying to do a key and cross domain analysis between two tables. In the available pair section, for the base table, not all its columns are appearing under the Compatible column list.

Does this mean that there is no corresponding compatible column in the paired table(but in fact there is a corresponding column, in my case a date column)? If a column pair is not appearing under the compatible list, is there a way to do the same. How does Information Analyzer calculate this compatibility? Some columns of the base as well as some columns of the paired tables are not appearing under the compatible pairs.