Adobe form hangs after error message

Hi All,

I developed interactive adobe form with 1 field as mandatory. Form is integrated with webdynpro and working fine but if user dont pass value to mandatory field, it gives error 'Atleast 1 required field empty' but after that form hangs. it is not responding so that i can fill the value.

I made field object->value type as 'User entered - Required'.

Please suggest if i am missing something.

Thanks