I recently merged two TMG data sets. I notice that the people and the sources retained the numbers they had in the two separate (prior to merging) data sets, except that the numbers are now prefixed with either "1:" or "2:". That's not really of much concern to me; however, when I go to select a source citation, the entire Master Source List is not available to me. If I am entering data for a person with, for example, the number 1:353, I can only cite sources that are of the form 1:XXX. When I type in a 2:XXX source, TMG returns the error message, "Cannot select a source from a different set." This is confusing, because I thought I had merged the data sets into one. Any suggestions?