After upgrading CA DB2 Tools from R19 to R20
under RC/EDIT option,
It is not possible to "edit" the rows.
Release : 20.0
Component : CA RC/Update for DB2 for z/OS
The DEFAULTS option is set to NO in the SETUP00 member in R20 CDBAPARM whereas the DEFAULTS parameter is set to YES in R19 version of CDBAPARM dataset.