Liitän pysäköintiluvan oikaisuvaatimukseen.

Finnish often leaves the subject pronoun out when the verb already shows who is doing the action.

Here, liitän ends in -n, which marks first person singular: I attach / I enclose.

So:

• Liitän ... = I attach ...
• Minä liitän ... = also correct, but minä is usually only added for emphasis or contrast

This is very normal Finnish.

Liitän is the 1st person singular present tense form of the verb liittää.

So:

• dictionary form: liittää
• present stem: liitä-
• liitä- + -n → liitän

This verb can mean things like:

• attach
• append
• enclose

In formal document language, it often means attaching a document to another document or message.

Because it is the object of the verb, and in this kind of sentence Finnish uses the total object form.

The idea is that the whole parking permit is being attached, as a complete item.

So:

• pysäköintilupa = parking permit
• pysäköintiluvan = the parking permit, as a complete object in this sentence

Many learner materials describe this form as:

• genitive singular, or
• a genitive-looking accusative/total object

The practical point is this:

• Liitän pysäköintiluvan ... = I attach the whole permit
• Liitän pysäköintilupaa ... would sound different and would suggest a partial/incomplete/unbounded object, which does not fit well here

Because it is in the illative case, which often means into or to.

Here it marks the thing that the permit is being attached to.

So the pattern is:

• liittää jokin johonkin = to attach something to something

That means:

• pysäköintiluvan = the thing being attached
• oikaisuvaatimukseen = to the claim/request it is being attached to

Also, oikaisuvaatimus is one of the noun types that changes its stem in certain cases:

• oikaisuvaatimus
• oikaisuvaatimuksen
• oikaisuvaatimukseen

So the form is not just a simple +n ending added to the basic dictionary form.

Because Finnish often uses case endings where English uses prepositions.

In English, you say:

• attach the permit to the request

In Finnish, the illative ending on oikaisuvaatimukseen does that job.

So instead of a separate word like to, Finnish builds the meaning into the noun ending.

This is one of the biggest structural differences between English and Finnish.

Yes. Both are compounds, and Finnish uses compounds very heavily.

They break down like this:

• pysäköintilupa = pysäköinti
  • lupa
• oikaisuvaatimus = oikaisu
  • vaatimus

In Finnish, compounds are normally written as one word.

When a compound is inflected, the case ending usually goes on the last part of the compound:

• pysäköintilupa → pysäköintiluvan
• oikaisuvaatimus → oikaisuvaatimukseen

That is completely normal Finnish word formation.

Yes. Finnish word order is more flexible than English word order because the endings show the grammatical roles.

The original order is a neutral, natural written order:

• Liitän pysäköintiluvan oikaisuvaatimukseen.

But other orders are possible, for example:

• Pysäköintiluvan liitän oikaisuvaatimukseen.
  Emphasizes the parking permit
• Oikaisuvaatimukseen liitän pysäköintiluvan.
  Emphasizes what it is being attached to

Even when the order changes, the case endings still show what each word is doing.

Yes, it sounds fairly formal and administrative.

That comes especially from:

• oikaisuvaatimus, which is a legal/administrative term
• liittää, which is common in formal written communication

This is the kind of sentence you might see in:

• an official email
• a form
• a complaint or appeal document
• a message to an authority

In casual everyday speech, a person might choose a different phrasing depending on context, but this sentence is very natural in formal writing.

No. In this kind of context, it very often means enclose, attach, or append a document.

So it can be used for:

• physically attaching a paper document
• including a document with an application
• attaching a file to an email or electronic form

In administrative Finnish, liittää is one of the standard verbs for this idea.

The object would usually change to the partitive.

So:

• Liitän pysäköintiluvan oikaisuvaatimukseen.
• En liitä pysäköintilupaa oikaisuvaatimukseen.

Notice the change:

• positive: pysäköintiluvan
• negative: pysäköintilupaa

This is a very important Finnish pattern:

• in many negative sentences, the object appears in the partitive

So the sentence is useful not only for vocabulary, but also for learning object case behavior.