How to use dictionary View to lookup in Start Routine

Hello All,

I need to create a transformation from 1 data source(Smart Data access data source) to a planning ADSO.

I need to do 2 things:

1.I need to lookup Legacy Material no. from 1 dictionary view and get material no. in my target ADSO by writing logic in start routine.

Part No. present in Data Source,

part No ,Leg Material no. and material no. are present in Dictionary view ,

Material no. is present in Target ADSO.

Part NO and Leg material no. is same(Part no.= Leg material No.)

How it can be done .

It will be very helpful if you can share some sample ABAP code

2.change the format of some the source fields to format of the target fields by writing logic in start routine.

Please help

Thanks,

Ipsita