User Interface (Editable Grid)

I am using the add row in the dynamic link and delete of editable grid, am having  columns like  account and category  these are mandatory fields .

initially grid is empty if i click on add row link it will add a new row in grid.

now without entering data into columns(mandatory fields using required)  clicked on submit button .so it will throw validation for fields ( account , category). am deleted  the empty row and adding new row .the new row i added  is validating default. is there any way to handle this or its default functionality of appian

Thanks in advanced