This is a bitmap (PmProfileFieldMapBasicOdu) that marks which counters within this same profile/row have been declared invalid, per the MIB's description, meaning any field flagged here should be treated as untrustworthy rather than simply absent. Unlike the 'unsupported' bitmap, this one flags fields that the device did attempt to measure but doesn't trust -- e.g. because the bin was affected by a reset or clock event mid-measurement -- so an admin seeing an alarming CV or SES spike in this same row should check this bitmap before escalating, since the spike might be a measurement artifact rather than a real event; because this bin spans the whole current day and is still open, short error bursts get averaged into a slower-moving daily total -- useful for spotting a low-grade, chronic problem that the 15-minute bins would report as merely noisy. If the bit for EsOdu is set here for a given row, an admin would flag any errored-second value reported in that same row as unreliable for that interval rather than feed it into a trend chart.