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Basically, the solution we built is used to support the operation of companies that deliver oxygen tanks and other oxygen providing equipment to patients who need a constant supply of oxygen in their homes. The system is currently operational and in production.
The application is built using mainly custom modules on vTiger CRM, the only original modules we're currently using are the Accounts, reports, and configuration, the rest of the modules were built using vtlib, a helper library in PHP for vTiger to creat custom modules. We also had to make quite a couple of changes to the core in order to squash a few bugs and support current functionality. We also had to add a couple of custom uitypes, in order to implement some requirements, so we started numbering them above 800.
We hav several new modules and requirements to develop on this to add functionality to the project. These are described in further detail in the attached file.