The revised quotation (revision 5- 840,480 Baht) as attached in your email this morning is not correct.
You adjust mobilization to be 3 person on 1st trip and 3 person on 2nd trip. Following the timesheet one person in 1st lot continue working in 2nd trip. Therefore total mob shall be only for 5 persons following previous quotation (Rev4- 820,480).
We will issue revised service order for value 820,480 Baht.
As you mentioned that the invoice has already been issued with value 840,480 Baht, please confirm whether you will cancel the current invoice and issue new one, or issue credit note to offset the over claim value.