- Fixed Assets customization 
- Credit management customization 
- Payment program customization adapting it according with SEPA program.
- Other less relevant customization within FI module  / CO module .

with End-user support, I have experience on the following modules :  

- FI - AP -  Assisting to the user on the most common failures or errors that you can get from SAP, at the moment to post Vendor Invoices
                  into MIRO transaction, or MIR6 [Intercompany invoices ] . 
                  * Look for  AP reports that can match with end- user needs . The most useful ones are the standards ones. 

- FI - AR 
- FI - GL 
- FI - AM  - Assisting on traspassing Assets with Legacy from old ERP system into SAP .
                - Assisting on ABAON transaction [ Selling Fixed Assets through SD and FI module - retirement process with no customer]
                - Assisting on find out reports that can match with end-user needs - and auditing processes.
                - Assisting on manual depreciation process [ unplanned depreciation ] 
                - Assisting on manual Asset postings [ ABF1]
               
- SD -     Pricing : determine pricing errors and its configuration with the Pricing Condition . 
                             If error are not related to configuration, try to solve user mistakes