Hi Krishna,
Hope you are doing good.
Nice to hear from you again.
Perhaps I did not understand this right, but cant you just use the ABAP server as the UME? This will surely help you to take care of this:
"I need all the users from ECC Abap system to display in portal system without creating again in portal."
If this is the case, also do have a look at the below guide which will help you with
the UME configuration:
http://scn.sap.com/docs/DOC-23182
Hope this helps.
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Kind Regards,
Hemanth
SAP AGS
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