Hi Abdul,
These are standard message and framework perform the validation on before save. Y
ou can not save partial document you have to give mandatory details to create any document( Oppotunity or Salesorder etc). You should enter detials so such validation error should not occur.
If you intentionaly want to skip these message then it is not allowed to skipp framework validation message. In Standard BO you can add your custom message but can not skips message raised from framework.
If you can referesh your UI before message apears then it could solve your purpose. (try with EC with custom action which trigger
Regards
Sunil