hansva commented on issue #8187:
URL: https://github.com/apache/hop/issues/8187#issuecomment-5474866112

   It seems our documentation is missing this, but Environment variables are 
loaded before project variables.
   The current hierarchy is:
   
   ```
   Everything happens in Project.modifyVariables(), called from 
ProjectsUtil.enableProject():
   
   L211-230 — parent project's variables (recursive)
   L236-257 — PARENT_PROJECT_*, HOP_PROJECT_NAME, HOP_ENVIRONMENT_NAME, 
PROJECT_HOME
   L261-290 — environment configuration files: 
variables.resolve(configurationFile) then read described variables from it
   L292-316 — HOP_METADATA_FOLDER, unit tests folder, datasets folder
   L317-321 — the project's own described variables (config.variables in 
project-config.json, i.e. CONFIG_HOME)
   ```


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