SAP FI is commonly integrated with MM and SD component. SAP FI Integration with other modules means how the system maps with different modules and how the effect of those is passed into FI Module.
For SAP FI-MM, use the T-code OBYC
Whenever there is a delivery created with reference to a sales order, goods movement takes place in the system.
In case of standard sales order, you create an outbound goods delivery to the customer. Here movement 601 takes place. This movement is configured in MM and movement of goods hit some G/L account in FI.
Every such movement of goods hits General Ledger account in FI.
The accounts posting in FI is done with reference to the billing documents like credit and debit note, invoice etc. created in SD and hence this is link between SD and FI.
Tax determination: In case of a tax determination, there is a direct link between SD and MM.
Material movements in MM is done with respect to a Movement Type.
SAP allows us to use different G/L accounts for the various movements for the same material by linking this movement type to a transaction key and hence we can set G/L accounts as per movement type.