The Allow Changes to Progress Bill Data When Both Progress and T&M Exists check box on the JB Company Parameters form.

Select this check box to allow changes to progress billings (in JB Progress Billing) when both progress and T&M billings are used. Because T&M billings are not updated with changes made to a progress billing, this option should only be used if you are not concerned with Progress and T&M billings being out of sync.

Leave this check box unselected if you do not allow changes to a progress billing when a T&M billing exists. Instead all changes to progress billings will be made through T&M billings.