As Built structure refresh blocking
There is a checking for pending Remove or Install  transaction that occurs for these events:
    - During dispatch work order
 - When there is a successful Remove or Install
 - When the technician cancels a failed Remove or Install transaction from the transaction manager
 
This is to prevent the As Built tree refreshing when there are still pending or failed transactions. Once a refresh is done, no visual indicator is left that shows a pending or failed transaction is ongoing at the As Built tree.