Неоплату парковки указали в постановлении об административном штрафе.

The failure to pay for parking was noted in the administrative fine ruling.

Breakdown of Неоплату парковки указали в постановлении об административном штрафе.

• в: in
• указать: to indicate
• об: about
• постановление: the administrative ruling

Questions & Answers about Неоплату парковки указали в постановлении об административном штрафе.

Why is неоплату written as one word? Could it be не оплату?

Here it should be understood as the noun неоплата = non-payment / failure to pay, so it is written as one word.

• неоплату = accusative singular of неоплата
• не оплату would usually mean something contrastive like not the payment, but..., which is a different structure

A useful comparison:

• неоплата парковки = non-payment of parking
• не оплату, а квитанцию = not the payment, but the receipt

Also, learners may see неуплата in similar contexts. Both exist, but неоплата парковки is a common phrase in parking-related official language.

Why is неоплату in the accusative case?

Because it is the direct object of the verb указали (indicated / listed / stated).

You can ask:

• указали что? — неоплату

So неоплата changes to the accusative singular:

• nominative: неоплата
• accusative: неоплату

This is very typical after transitive verbs in Russian.

Why is парковки in the genitive case?