If I have undestood right your issue , then check FM SYSTEM_CALLSTACK, maybe it helps you to determine if ZVA05 has been called.
I'm not on a terminal with GUI logon so i can't verify what i'm writing, but i'm pretty sure this FM gives you the calling methods stack, like in the new debugger. If the FM gives transactions values , just check if exist an entry with the value desired,
Hope it helps