I am trying to edit a sub-screen customization, but SL2011 won't let me get into Customization Mode and displays the following warning message: "Only one application may be executing when customization mode is started."
Here is how I open the subscreen which I want to customize:
1. Open Customer Maintenance (08.260.00)
2. Pull records for a CustomerID.
3. Display Activity for the Cusomer (08.260.04)
4. Display Invoice Transactions for a Line Item (08.250.00). It is this sub screen I want to customize, but I can't go to Customization Mode, and get the above warning message.