If you're unable to see this module (ScreenID: PM301000) in the Financials ERP UI then it can't be accessed via the API. Project Accounting module should be activated in your licence and this should be configured & enabled in the Financials ERP.
(If you're missing the licence in your company and need help regarding ERP related topics you should contact your Partner Service from your market.)
Once the licence & ERP settings adjusted, we can help you with API related processes in this community.
Financials ERP UI > Enable/disable functionalities : ScreenId=CS100000 > Enable : Project Accounting
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