CPP0605203W Merged data set was unmerged. Therefore, you must re-evaluate the alias-to-catalog and SSA-to-catalog relationships

Explanation
You have unmerged a component data set from a merged
data set, causing it to revert to the high-level qualifier it had
before it was merged. Therefore, the data set's alias-to-catalog and
SSA-to-catalog relationships are also changed. 

System programmer response
Reestablish the data set's alias-to-catalog
and SSA-to-catalog relationships. For more information, see Defining HLQ-to-catalog relationships and Defining system-specific aliases (SSAs).