Fotografeer de beschadiging met het bestelnummer.

Because fotografeer is the imperative form of fotograferen, so the sentence is giving an instruction: Photograph ...

With many Dutch verbs ending in -eren, the imperative looks like this:

• fotograferen → fotografeer
• proberen → probeer
• studeren → studeer

This is very common in instructions on forms, websites, and packaging.

Dutch usually leaves the subject out in an imperative. Just like English says Take a photo, Dutch can simply say Fotografeer ...

The missing subject is an understood you. In instruction-style Dutch, this often means whoever is reading this.

If someone wanted to make it more polite or less direct, they might use a different structure, for example:

• Wilt u de beschadiging fotograferen?
• Kunt u een foto maken van de beschadiging?

But for short instructions, the bare imperative is normal.

De is used because the sentence refers to a specific piece of damage already known from the context: the damage on the item being discussed.

So:

• de beschadiging = the damage / the damaged spot we are talking about
• een beschadiging = a damage / some damage, not yet specific

Also, beschadiging is a de-word. A useful pattern is that nouns ending in -ing are usually de-words.

They are related, but not identical.

• beschadiging usually means a specific damaged area, defect, or instance of damage
• schade is broader and often means damage in general, sometimes more abstractly

So in this sentence, beschadiging fits well because the instruction is about taking a photo of the actual damaged part.

Compare:

• Er is schade aan het pakket. = There is damage to the package.
• De beschadiging zit aan de hoek. = The damaged spot is on the corner.

Literally, it means with the order number.

In this context, the most natural interpretation is: the photo should include the damage together with the order number, or the damage should be photographed in a way that the order number is also linked to it clearly.

In practical terms, it often means something like:

• show the damage and the order number in the same photo, or
• send the photo along with the order number

It usually does not mean using the order number as a tool or method. If Dutch wanted to express that kind of meaning, it would normally use a different phrase.

Because nummer is a het-word, and Dutch compound nouns normally take their article from the last part of the compound.

Here:

• bestelnummer = bestel
  • nummer
• the head word is nummer
• so the whole compound is het bestelnummer

This is a very useful Dutch rule:

• de tafel → de keukentafel
• het nummer → het bestelnummer

Dutch very often joins words together into one compound noun.

bestelnummer is made up of:

• bestel- = relating to ordering
• nummer = number

So it literally means order number.

A key rule with Dutch compounds is that the last part is the main noun. A bestelnummer is a kind of nummer.

This is why Dutch writes it as one word, not two.

Yes. This is a very normal Dutch imperative structure:

imperative verb + direct object + extra phrase

So:

• Fotografeer = imperative verb
• de beschadiging = direct object
• met het bestelnummer = extra prepositional phrase

That order is natural and straightforward in instruction language. Dutch often puts the main thing to be acted on right after the verb, and then adds extra information after it.