Hi RB,
this is what i am doing
i run t code RSA1 and go to source system.
Then right click on SAP and click on create
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Then i enter the RFC and user details
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Then it pops up in UG1(ECC system ) login screen and asks to enter with admin user
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The it pops up below screens
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When is click on use i get below error
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R3SBP200 being other ECC source already connected to BI system