K. Uthai krub
On his daily work offshore, he charge against W/O as he works for on each day. See example below:
• Work for FE, charge to W/O of that work of FE.
• Work for AI, charge to AFE of AI.
• Work for COG, charge to W/O of COG.
• Wok for field, charge to field.
When he worked for AIT, we did not have WA for SIWA.