res_path - RESOURCES option
Usually, resources are defined in the dictionary. in special cases, however, resources cannot be provided in the dictionary and a separate resource database is required. When a resource database has been defined, application resources are searched in the resource database, but not in the dictionary.
E.g. when running an application that works on the development database with the dictionary odaba.sys , the resources, that one might want to test are not defined in this dictionary, but in the resource database ode.dev . Defining the database ode.dev as resource database in addition to the dictionary will solve this problem.
The dictionary for the resource database is always the system dictionary defined in the SYSTEM section of the configuration file.
Usually, this value is set in the configuration or ini-file in the RESOURCES option for the data source definition.