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Estimating the upgrade effort from SAP version 3.1i to 4.6c

Our expert recommends resources for healthy mySAP ERP system upgrades.

I would like to know the differences between version 3.1i and 4.6c from a developer's perspective when upgrading. Specifically, what codes would need to be changed or checked in particular user exits. Can you please provide a short checklist of things to be verified or changed? I understand it's a very general question, I appreciate your answer.
It is indeed a very general question. But you are right, estimating the upgrade effort is not an easy endeavor. We therefore voted a entire chapter to the subject in our latest publication, mySAP ERP Upgrade Project Guide, published by SAP-PRESS. It discusses many things to be verified and to be considered plus tips and tricks to estimate upgrade efforts when upgrading to a new SAP release.
This was last published in August 2006

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