Each person receiving a travel advance shall submit an itemized statement meeting the requirements of §§ 3-9-8 , 4-9-4 , and the rules promulgated pursuant to § 3-9-18 . If the advance exceeds the actual expenses, the difference shall be repaid as set forth and under the conditions specified in the rules and regulations promulgated pursuant to § 3-9-18 . All amounts repaid pursuant to this section shall be credited back to the budget units' appropriated funds. However, general fund advances, or any portion thereof, which transcend a fiscal year revert to the general fund and become an obligation of the following fiscal year's appropriations. Source: SL 1974, ch 45 , § 3; SL 1975, ch 37 , § 2; SL 1984, ch 30 , § 81.