Getting "Out Of scope" in watch window

Hi,

When I add a variable 'flags' to watch window, i'm getting value as "out of scope" even when PC( program counter) is at next line. Below is extract, could anybody let me know why its happening.

Code extract:

V3_VIRTUAL_PKT
v3_pk_alloc(int size, V3_VIRTUAL_PKT p_pkt, int flags)
{ if (flags & hf_ipaddr) return v3_udp_alloc(size, p_pkt); else { dtrap(); return NULL; }
}