I'm on reserve as a ATL 717B dude, and the PWA and Crew Scheduling Handbook both talk about greenslips the following way:

"will receive single pay, no credit (above his reserve guarantee) for the portion of a GS
rotation that he flew and that interrupted an X day or was flown after his accumulated
credit equaled the ALV, and additional time free of duty under Section 23.S.11"

What does it mean to get NO CREDIT? If you can translate this paragraph into plain English I'd be obliged...