CPP0605212E No candidate data sets exist for merging with the target data set

Explanation
You selected a target data set for merging, but
no data sets are eligible for merging with it.

System action
The data set is not merged. Merge processing continues
with the next selected data set.

System programmer response
Review your selection. The rules for
merging data sets are described in Merging and unmerging data sets. 