Read-only grid issue

Hello, 

I have a simple form with 2 textboxes and a read-only grid.

Text Boxes are "required"

Grid is selectable and set to "selectionRequired :true"

Submit button is set to "validate: true"

Issue:

1) When the from is initially displayed and i click Submit button, the "required" validation works only for textboxes and after entering inputs into textboxes, i am able to submit the form. The required validation does not work on the grid.

2) however, if I select a row in grid and unselect it and then click submit, the "required" validation works and message is displayed.

not sure if I am doing something wrong or if this is Appian bug. 

Please let me know if anyone else faced this issue.

JR