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Explanation: Son distintas opciones en el español de España, dependerá de cómo formules la pregunta. Una opción:
¿Dispone de documentación para poder "contrastar/como justificante" de los datos de la declaración?
Ruth Romero Local time: 11:19 Native speaker of: Spanish PRO pts in pair: 57
Explanation: In Spanish you "sustentar" a statement or case. You can also "apoyar" it.
(To "sostener" is maintain an argument or allegation, generally over time.)
A good trick to double-checking terminology like this is to run a search on www.google.com, or www.altavista.com, with your proposed phrase, to see how many hits you get. Go to the advanced search function, and selected the language as well as the domain (for instance, if your target is in Mexico, select .mx ... this helps you keep consistent with the area you're translating for. :-)
Carol Shaw Local time: 04:19 Native speaker of: English, Spanish PRO pts in pair: 43