I'm facing some issue in checkbox. On some condition it should be able to check the checbox. It was working fine till now. But dont't know why it is not working!

1st form:Order

2nd Form: Line items.

one Order has multiple line item.

In the line item one check box is there. If  the check box of all its line items is true, then Order form's one checkbox should be enabled. Earlier it was working fine but right now its not working.

is it a org problem or what?

How to fix this issue  please contact me ASAP!!