How to connect one ECC to multiple PI using ABAP proxy

Hi

I need to connect multiple PI servers ( 7.0 and 7.3 single stack) parallely.

I know how to connect individually to 7.0 and 7.3. But we need to connect both at the same time. I dont want to do this using WSDL export.

Because we have already generated ABAP client proxies for both 7.0 and 7.3 individuallt..both are working individually ( means if switch sxmb_adm rfc destination to 7.3 only 7.3 related interfaces are working and if i switch back to 7.0 only interfaces related to 7.0 are working). But requirement is both should work at the same time.

is it possible by creating logical ports? ( there are some blogs for this, but all those blogs explained about WSDL export method of generating proxy not using SPROXY t-code)

Is there any way we can mention either port or IS_URL in ABAP code.?? ( we need to mention 2 Integration server url's in sxmb_ADM using sub paramerts)

Thanks,

Murali.

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