Section 80Republic Act No. 992, Presidential Decrees No. 75 and 999 and all laws, decrees, executive orders, rules and regulations or parts thereof which are inconsistent with the provisions of this Decree are , Sec./Art. 80

Additional Conditions for Payment of Travel Expenses. When travel is done by water and subsistence is not included in the transportation cost, the amount actually and necessarily spent for subsistence during such travel time shall be paid, and no per diems shall be allowed in lieu thereof.

Per diems and travel allowances shall not be granted to members of field parties or others for whom subsistence and/or allowances in kind are supplied or other special provision made to cover travel expenses.

The travel expenses of a government official or employee who is assigned to render a special service to any private person or entity, the expenses for which are payable by the latter, shall be paid from a deposit which the private party shall be required to make before the performance of the special service is commenced, subject to the limitations and requirements herein provided for travel expenses payable from government funds.

No official or employee of the Government who remains temporarily at one station for a period longer than one month shall be paid per diems in excess of one month, except upon the approval of the head of department, and, in case his temporary stay in any one place exceeds three months, payment of per diems in excess of three months shall be made only upon the previous approval of the Commissioner.