How do I remove all the values of the GSO PSWD PSWDPLST field. In other words how do I specify NULL for this field?
A NULL value for the GSO PSWD PSWDPLST can be specified via the following CA-ACF2 commands:
CHANGE PSWD PSWDPLST() REP
You would issue the command with the REP option since the default is ADD. REP requests that the existing data is replaced with the provided data. For example, without REP if the PSWDPLST contained (# &) then specifying () would only 'add' null to the existing list. The REP is needed to replace the existing list.
Consult chapters 11 and 14 of the CA ACF2 for z/OS Administration Guide for more information.