Yaowalak san, Nattaporn san,
This problem is caused following reason.
1. KTS – Resin supplier revise price every 3 months. And KTS PUR inform KTS member of it.
2. KTS-Kasai JPN have common price list but not revised so often.
3. When KTS issue invoice, KTS use latest price but JPN check with not revised list.
4. That`s why there is un-match for invoice price.
I think we need to make rule with JPN.