2LIS_18_I0CAUSE

Hello,

I activated 2LIS_18_I0CAUSE datasource when i try to see the data via RSA3 it showing 0 records, this datasource contains three files QMEL , QMFE , QMUR

all the tables having data when i view by t-code SE16 and table name

But when I try to extract(RSA3) the data its showing data as 0

Where we can find the relationship between these three tables like which key is common in all these three tables?

Your input will be appreciated.

Thanks