How to block Sales Order and Delivery when the previous AR Invoice Transaction is not yet paid

Hi Experts, 

Im penning and processing a codification for my Transaction Notification yet one cant fig it retired anyone tin assistance me, this is the details :

I privation to Block the Sales Order and Delivery with the pursuing condition
1. If determination are erstwhile AR Invoice(Last Transaction) are not paid
2. If the past Delivery of the lawsuit is not yet copied oregon encoded to AR Invoice.
3. if Due day + 10 Days has past from the owed of the invoice