XP ASSERT

Hi

When running a checked build of XP SP2, I have a disk filter driver that causes the following assert from the dispatch routine completion routine. Which is working perfectly ok on Windows 2K SP4

think the assert is something like
ASSERT SRB->BUFFER == IRP->CPYBUFFER

Can somebody explain?

The actual assert is

Pkt->Srb.DataBuffer == Pkt->BuffPtrCpy