What is Validation Log?
Validation Log includes any errors or warnings reported by SSIS Runtime engine. Make sure you correct any validation errors after migration in order to run your package successfully. Validation errors are not necessarily problems with conversion but most of the time its problem with connection string, permission issues, file not found etc. Validation errors (red x sign) are critical to fix. Until you fix all validation errors your package may not run. Validation warnings (yellow exclamation sign) are non-critical and mostly fixing warnings may increase performance of SSIS package. If you do not fix warnings your package will still continue to run but you may not get full performance.
