Custom logon module : updated UME attribute not available in SAPLogon ticket in first logon

Hello,

I have created a custom logon module 'SetIdMappingLogin' to set UME attribute 'REFERENCE_SYSTEM_USER’ for a user if not already set so that user is able to access SAP R/3 applications without any issues.

I noticed that for a user: -

1. When logon module runs, it is able to set this attribute but when user tries to access SAP applications, this ref.system user id is not present in SAP Logon ticket.

2. Now when user logs off and logs in again, this ref.system user id is present in SAP Logon ticket and user able to access all application without any issues.

I am trying to understand why this is happening.

Please find attached screenshot for list of logon module I have inside component 'ticket'.

Please help.

Thanks & Regards,

Amey