Hi Daniel,
Yes your understanding is correct.
1) Do you have any code/link/doc for the same where I can use it for my customer exit.
Search in google "SAP BW BEx custom exist variable"
2) Can we not use this customer exit variable for value exclusion instead of include selection
In custom table maintain SIGN and provide values I-Include, E-Exlcude and fill same value in customer exit variable.
3) will this customer exit selection not have impact on the query performance ?
There is impact however its count less
4) If you are unable to provide the code, do I need to repost this query in the abap forum to get the customer exit code. Please advice.
There are enough blogs in SCN SAP community about customer exit
Easy implementation of BEx-Userexit-Variables
Thanks
Nanda