Hi Koti,
This is just a yellow warning, did you un-check the process data in memory option from performance settings? this can be done from goto->performance settings->process data in memory (un-check).
Also it is advised to use data package sizing in APD when you use query as source, as the BEx has 1million restriction. best to suppress the un-necessary result rows in query designer.
Update the thread if issue is solved.
Thanks,
Maddy