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Having Dynamics AX 2012 R3 CU8 with many customizations made by third party
How to upgrade to CU13 without loosing customization
we made a new environment and copied live data to it
Thanks in advance for help
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Once you follow steps for upgrading your code , you have to resolve code conflicts . Resolving code conflict should involved objects from third party as well.
You have to compare all objects that changed between CU8 and CU13 and that have also been customized by you. Then you need to merge the MS changes from SYP layer to your customization layer. And in some cases you need to reimplement your customization in a new way in order for it to work with the new MS code.
https://docs.microsoft.com/en-us/dynamicsax-2012/appuser-itpro/apply-updates-and-hotfixes
Microsoft does not know what customisations are in your system, nor how, or why those were done
Your code can be moved to your new environment. https://docs.microsoft.com/en-us/dynamicsax-2012/appuser-itpro/models-layers-and-the-model-store
You have to look at the modules affected by the CU and test thoroughly and make any code changes needed.
This is not the sort of thing to do unaided without professional help.
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