To upgrade existing InfoObjects to latest BC or not?

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Hi,

We have a test system that was upgraded from BW 3.1 to BI 7.0. It includes several custom cubes that we have built with largely standard business content (3.3) InfoObjects.

I have started testing the extraction of R/3 data into these InfoObjects, and find that some of InfoObjects are failing in the ETL process.

My question is: Would it be best to upgrade our legacy BC 3.3 InfoObjects to the latest BC 7.03?..(Followed by reactivating our custom cubes).

Also, some of our InfoObjects may have had minor modification such as having certain Navigational Attributes turned on. Will an upgrade of the InfoObject to a later version of the Business Content necessarily lose such changes or can such changes be passed over to the new version?

Regards

Adrian