Dear Khun Nivat,
I believe Khun Kriengsak has discuss this with you already but while reviewing this project documentation, invoicing and cost etc… I noticed the we were on site purging Nitrogen from Oct. 4th – Oct. 8th and Nov. 3rd – Nov. 7th and have not invoiced for this period as per our contractual agreement. I have attached the invoice summary and supporting activity time sheets signed by ThyssenKrupp representative and kindly request you approve so I can invoice.
Please note, we want to build a good working relationship with ThyssenKrupp and are willing to give a little and where possible but I still have to recover my cost. If you have any questions please do not hesitate to contact me for discussion.