InfoPath Dev

I am Having Attachment Field in Infopath 2010 form, i want to make it mandatory on some condition, when i set the validation rule on attachment filed and i check condition like "someField=1 and attachment is blank" then cannot be blank it returns Fatal Exception. I tried it from code, I can Successfully make it mandatory by checking ...

I am Having Attachment Field in Infopath 2010 form, i want to make it mandatory on some condition, when i set the validation rule on attachment filed and i check condition like "attachment is blank" then cannot be blank it returns Fatal Exception. I tried it from Attachment Change Event by setting another flag field, setting filed value ...