Ae,
Non PO doesn’t mean no procurement involve, it’ allow to use contract in case vendor do not accept PO, but Procurement activity, i.e., contract / negotiation / vendor register still need as usual.
Also I think the section you pull from guideline it’s for assignee / visitor when have short visiting period to Thailand, not local employee. Let seek advice from procurement global if you are unsure with policy.
Kh.Ratree, the attached information were deleted, could you forward me information in detail. How long the period, payment condition. I will check and see if anything I can help to shortcut the process.