Dear Khun Porntip,
Due to supplier request signature for price approval, we have to provide contract.
Purchase section and only one person cannot sign for except cost by ourselves.
As we know, we cannot supplier is product owner, we are necessary to use them.
We will ask SIAM DAIKIN to provide contract as below .
Y2015 (Nov 2015-Oct 2016) Inspection 12 times per year and Cleaning 2 times per year
Y2016, 2017 (Nov 2016-Oct 2018)Inspection 9 times per year and Cleaning 2 times per year
Purchaser will request quotation for Y2015 and send you for QR issue in advance.