The Partner shall not be entitled to offset any amounts against the Purchaser unless his claim is undisputed or established as legally valid.

合伙人无权冲抵应付买方的任何款项，除非其要求没有争议或者被确定合法有效。上述规定同样适用于合同附加的任何保留权（留置权）。

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Some of his allies think that Southie's secret deals are not legally valid.

ECONOMIST: Development in Boston

The contract was not approved at the general meeting of MOR's shareholders and is therefore not legally valid, Viktorov insists.

FORBES: The Boomerang Effect

Similarly, Germany's Federal Supreme Court ruled in 2005 that regarding an operation as a precondition for a legally valid sex change was increasingly problematic.

ECONOMIST: Sex is a complicated thing to define