Checked for authorisation on sales process; 
 Tax Invoice/ Delivery Order: There was authorised signature of K.Alisa (General Manager) or K.Montchai (Charge of service)respectively on the Company's Tax Invoice to customer. 
Checked for posting to subledger and GL. ( Same date as Invoice.) 
Agreed with supporting document ( Invoice, debit note from OKUMA, service fee agreement with OKUMA, Credit Advice from Bank, Summary of installation support fee of the month, 
Document price agreement with Tatung, Agreement of Reimbursement for sales profit).