hi Nilesh, you may be able to set multiple IdP's for your application. I learned that from the openSAP course next Steps on cloud development. as far as mapping multiple external users to one HANA user I do not think that is logically possible unless your users share credentials which again is not what you need. in an implementation of SAML at one of my clients, they had a SAML enabled application and their external users were set up on a subset of AD to aid on the SAML authentication. as you have multiple domains, it brings me to believe that you may be able to use either multiple IdP's or possibly create AD groups which would share a user in HANA. Again, it will depend on how you need to monitor the use of HANA for those users. in my case we needed to know the logged in user so we needed to set up the external users as HANA users. I know this is not an answer but at least some thought for your question.
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