Toolbox

 hg clone https://code.openbravo.com/erp/devel/main openbravo30
 hg tags         --to see which is the latest version
 hg up 3.0RC4    --change RC4 with the latest version

Copy your modules to a new directory

 cd yourInstanceDirecotry
 cp -r modules ../modules

In this new directory remove all module directories (if any) that are present in 3.0 distribution.

  cd ../modules
  ls -1 openbravo30/modules/ | xargs rm -r

If you have org.openbravo.base.seam or org.openbravo.client.freemarker modules, remove them.

 rm -r org.openbravo.base.seam
 rm -r org.openbravo.client.freemarker

If you have installed Quickstart you should remove the directories for the template and dataset modules.

rm -r org.openbravo.quickstarttwo/ 
rm -r org.openbravo.quickstarttwo.datasets/

Copy your modules to 3.0 modules directory

  cp -r * openbravo30/modules/

At this point you have a clean 3.0 sources with all the modules you had in 2.50 and do not have a 3.0 version.
Reconfigure the 3.0 instance in the same way you had it in 2.50

 cd openbravo30
 ant setup
 cd config
 ./setup-properties-linux.bin

Rebuild the application

 ant update.database trl.lib wad.lib compile.complete.deploy

Restart tomcat
Login the application.

Additional changes

You can also decide not to apply the default simplification template (which is applied by default in 3.0). If you want to do so:
- Go to Module window
- Select Openbravo 3.0 template
- Uncheck Apply Configuration Script
- Run ant smartbuild -Dlocal=no -Drestart=yes
Scan for updates for the rest of modules that you have installed but you don't maintain and install them.
Ensure the modules you have are consistent: ant check.module.consistency

Retrieved from "http://wiki.openbravo.com/wiki/Manual_Upgrade_From_2.50"

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