hayamos impugnado
-we have challenged
Present perfect subjunctivenosotrosconjugation ofimpugnar.

impugnar

Si el comprador es una empresa, no le corresponderá ningún derecho de retención por las reconvenciones que hayamos impugnado o que no sean firmes.
If the purchaser is an entre-preneur, then he shall have no right of retention on account of counterclaims that are contested by us or not established by force of law.
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