Funds management and project budgeting

Hi

We have funds managment activated for operational expenses(OPEX).

Project budget will be used for all CAPEX requirements. However, there will be common G/L accounts used in both operational expenses and capital expenses. For eg. steel could be issued both for projects as well as maintenance activities.

Please clarify on the following:

1) How to avoid duplication of budgets in PS and FM.

2) Can we forego PS budgetings and depend on only FM budgeting to meet the above issue. Can't we achieve the PS budgeting functionality in FM.

3) What differentiates or advantages we get in PS budget over FM budget.

Regards

Srikrishna