Hi,
Of course not..Where do you do the testing? Isn't it in QAS? Since you don't have QAS, your DEV will be your QAS..Since you are going to use your DEV as your QAS, you don't need your DEV data, therefore you must delete DEV data before doing the testing..
OR if you want, so you won't be confused, don't connect any of your datasources coming from ERP DEV..Just use all ERP QAS datasources in your BI DEV..
Regards,
Loed