Depending on ERP there can be many modules inside..
Major modules of peoplesoft ERP are :
1. Human Resource Management Systems HRMS
Submodules: (payroll, Core HR, benefits, recruitment, performance management)
(Account payable AP, Account Receivable AR, General Ledger GL etc..)
3. Supply chain Management SCM
4. Customer Relationship Management CRM
Functional consultant major work is during GAP Analysis To find As-IS state and identify work required to achieve TO-BE state.
Find all those forms which needs to be modified, and all those reports which needs to be modified And Exactly what field to change, What button to remove, What functionality to be disabled, What pre-delivered business logic behind components to be modified and What formulae to be used during modification.
There is Another Module which is consider Techno-functional Peopesoft EPM. EPM is datawarehouse part which has four major components for Each of four above there is a data mart for each area of finance, HR, SCM, CRM.
Each contains data from its own module transferred using ETL tools and reporting using BI Tools and analytics can be applied over formulae in BI systems.
-Also functional consultant decide based on feedback from local management to modify field like in HRMS a rejoining of employee should get ID as previous from old record or new ID based of policy in management.
if Payroll of local market like irish payroll or indian payroll does not exits then it should existing global payroll should be modified to achieve local labour laws and saving rules , income tax based customisation.