A good model to start development of external module can be found here : [https://github.com/rdoursenaud/dolibarr-module-template GitHub Dolibarr Module Modèle]
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A good model to start development of external module can be found here : [https://github.com/Dolibarr/dolibarr/tree/develop/htdocs/modulebuilder/template GitHub Dolibarr Module Modèle]