Interfacing two SAP systems for data collection

hi,
A scenario. i have two sap systems, one is 4.7 and another is ECC. based on one value in 4.7 i want to collect data from ecc. this has to happen thru XI. so shud i write a function module in ecc which takes as parameter the input value and picks data from database and exports the same and enable this function module as RFC ?
so then from XI this function module can be called with the required input parameter ? can anyone give me the code/steps or how to do this ?
thks

Hello,
why do you want to use XI? I would create a RFC-enabled FM in the ECC system and a RFC destination (transaction SM59) in the 4.7 system (calling the ECC system). Then create a report in the 4.7 system, getting the value and calling the RFC in the ECC system via:
CALL FUNCTION <RFC function> DESTINATION <RFC-destination>
Best regards
Stephan

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Interfacing two SAP systems for data collection

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