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Revisen el contrato por si ha habido complicaciones.

Revisen el contrato por si ha habido complicaciones.
Check the contract in case there have been complications.
From Lesson 550:Impersonal haber (ha habido, va a haber)·Spanish (Spain)

Questions & Answers about Revisen el contrato por si ha habido complicaciones.

Why is it ha habido and not han habido since complicaciones is plural?
Even in compound tenses like the present perfect, impersonal haber (meaning "there to be") only exists in the third-person singular. Just as you say hay complicaciones (there are complications), you must say ha habido complicaciones (there have been complications). The word complicaciones is the direct object, not the subject, so the verb doesn't change to match it.
Why does por si trigger the indicative mood (ha habido) here instead of the subjunctive?
The phrase por si (in case) takes the indicative mood when the situation is seen as a real or reasonable possibility. Because the speaker thinks complications might have actually happened, they use the present perfect indicative (ha habido). You would only use the subjunctive (specifically, the imperfect subjunctive) after por si if the scenario was extremely unlikely.
Since this is European Spanish, shouldn't the command be revisad instead of revisen?
It depends on the level of formality. In Spain, revisad is the informal plural command for vosotros. The use of revisen means the speaker is using the formal plural ustedes. This makes perfect sense in a professional context, which fits the topic of checking a contract (el contrato).
Could I just say por si hubo complicaciones instead of using the present perfect?
Yes, but the nuance shifts. Using the present perfect (ha habido) connects the past action to the present, implying the complications might have just occurred or are highly relevant right now. Using the preterite (hubo) would make the complications feel like a closed, distant event. In Spain, the present perfect is strongly preferred for events that still feel connected to the present.

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