Transformation in 0IC_C03

hi...

I have to load data for Inventory Management(0IC_C03). I have performed all steps in ECC and Bi side . Now  here flow is given below.

Now some field from Data source to infosource are not mapped for all DS to IS(BX, BF, UM) and also from infosource to cube, are not mapped.

1. Do i need to map it manually?

2. Do i need to add all InfoObject into dimensions for corresponding fields of all DataSources (BX, BF, UM)?

Guys pls help me out.

Pls explain in detail for this transformation.

i have read SCN threads but its not more clear, pls help me

E.g: Document date is there in all 3 datasources, so from which datasource it should be mapped to cube?

Thanks