Documentary evidence is required to validate the claim.

索赔须有证明文件方能有效。

youdao

While the test results don't guarantee that all upgrades will experience the same performance boost, they do validate the claim that more memory does help.

尽管这些测试结果不能保证所有升级都能得到这样的性能改进，但它们确实证明了更多内存是有帮助的。

youdao

For example, in the medical profession or in insurance claims processing, a second opinion, a second batter of tests, or a second estimate of damage is usually sufficient to validate a claim.

例如，在医药行业或者保险业的索赔处理，第二次主张、第二个检验人员或者对于损害的二次评估通常足以证明索赔的有效性。

youdao

"I have not seen any indication we can validate their claim, " the U.S. official said.

WSJ: Turkey Finds Pilots' Bodies, Providing New Spark for Tensions

This is when we need to involve the owner to validate our claim.

BBC: Have Your Say: Replacement car costs