Best Practice for Upgrade in FPN-Landscape

Hi there,
we have already implemented a consumerportal with two producerportals.
Now we want to upgrade our consumerportal from SPS12 to SPS15.
It´s better to disconnect the producer and reconnect these portal after upgrading again?
Or it´s not a problem to upgrade a consumerportal while producer are connected?
Same question in other way. If we upgrade a producersystem. May we disconnect these portals until the upgrade on producersystem is done and connect again?
Wait for your helpful experience :o)
Best regards
Christian

It´s better to disconnect the consumersystem from producer.
After Upgrad all is fine.

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https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/7e259990-0201-0010-6085-e7c5aec5af1d
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Subject: Best practice for migrating IDOC's?
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Best Practice for Upgrade in FPN-Landscape

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