https://userapps.support.sap.com/sap/support/knowledge/en/2315394
2315394 - CREATE LOGIN calls for sp_extrapwdchecks before checking the login name - SAP ASE | SAP...
sp_extrapwdchecks() is updated even when the "create login" command fails. Only the password for the second duplicate login name works.
https://userapps.support.sap.com/sap/support/knowledge/en/2068104
2068104 - Msg 3626 State 4 when sp_extrapwdchecks is used - ASE | SAP Knowledge Base Article
After adding customized password checks with sp_extrapwdchecks sp_addlogin may error: Msg 3626, Level 17, State 4: Server 'xxxxxx', Procedure 'sp_password',...