(d) For purposes of subsection (a), proof of out-of-pocket expenditures may be demonstrated by invoices or other evidence of a purchase and installation, as determined under rules or guidelines prescribed by the department of local government finance.

https://codes.findlaw.com/in/title-6-taxation/in-code-sect-6...

Such advances could be reconciled based on actual costs demonstrated by invoices.

http://townhall.virginia.gov/L/ViewComments.cfm?stageid=3614

As demonstrated by invoices attached as Exhibit A, the MC-5 submeters
and associated equipment were shipped to Electrotech on December 18, 2013, and July
17, 2014.

http://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRe...

Halladay will be referred to as the defendant. Between March 5, 1954, and April 15, 1954, plaintiff purchased from Wright Lumber Company 13 accounts receivable which were evidenced by invoices which showed, or purported to show, sales of lumber to defendant.

https://law.justia.com/cases/california/court-of-appeal/2d/1...

Obtain financing for domestic and foreign trade transactions evidenced by invoices.

https://www.citigroup.com/southafrica/homepage/gts_tf.htm

The second count was based upon a check issued on January 24, 1979, for deliveries made and evidenced by invoices dated January 16, 1979 and January 18, 1979.

https://casetext.com/case/griffith-v-state-156