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Hey @tingwuwang, let me try:
Expenditure capitalization always results in cash OUTflow, it is just a matter of where this is classified under cash flow statements (operating vs. investing).
So if I capiltalize an expenditure, that means instead of it registered as a cash outflow in operating activities, it is being reclassified under cash outflow in investing activities. And therefore the total cashflow of operating activities will increase (to remove the cashoutflow being reclassified to investing activities), and total cashflow of investing activities will decrease (as it now has to deduct cash flow due to this expenditure).
Does this make sense?