Article 4.1.1M : Kwh reading not matching
1. Check for CT ratio programed in the meter.
2. Check for Phase sequence and if found OK.
3. Check phase wise S1 & S2 is connected reverse. ( if meter is having RD option meter) Total Kw shows less if CT is reversed.
Hence corrected the wiring.
4. check where CT is placed in Incoming and reference meter CT is placed
CT of reference and must should be in same location.