Hi,
Please take MM consultant help and find the base tables.
Or You can try on your own by using F1 help on particular field, next screen use technical settings.
You will get base table and field names also.
Once you base tables, thru table name you can search on Google engine for data sources.
You need material master data sources also.
for master data source search at ECC Tx - RSA5, use MATERIAL*
There are MM Data sources which start with 2LIS_02*,. please check 2LIS_04_P_MATNR.
Thanks