في فاتورة الشراء لا يوجد رقم طلب.

في means in or on/within, depending on context. Here it introduces the location or context:

• في فاتورة الشراء = on the purchase invoice / in the purchase invoice

Arabic often begins a sentence with a prepositional phrase like this to set the scene first. So the sentence structure is roughly:

• In the purchase invoice, there is no order number.

This is very natural in Arabic.

لا يوجد means there is no or more literally there does not exist.

Breakdown:

• لا = not / no
• يوجد = exists / is found

So:

• لا يوجد رقم طلب = there is no order number

This is a very common Arabic way to express English there is / there are in the negative.

Examples:

• لا يوجد وقت = There is no time.
• لا يوجد حل = There is no solution.

In Arabic, يوجد is often used as an impersonal existential verb meaning there exists / there is. It commonly stays in the singular masculine form when introducing something that exists or does not exist.

In this sentence, the thing being talked about is:

• رقم طلب = an order number

Since that noun phrase comes after the verb, Arabic naturally uses يوجد in the singular.

You will often see:

• يوجد كتاب = There is a book.
• يوجد كتب = There are books.

Even with a plural noun after it, the verb can still appear in the singular in this existential pattern.

This is an iḍāfa construction, often called a genitive construction or noun + noun possession structure.

• فاتورة الشراء literally = invoice of the purchase
• More natural English: the purchase invoice

In an iḍāfa:

• the first noun usually does not take ال
• the second noun can take ال if the whole phrase is definite

So:

• فاتورة الشراء = the purchase invoice
• not الفاتورة الشراء

Why? Because definiteness for the whole phrase is determined by the second noun:

• فاتورة شراء = a purchase invoice
• فاتورة الشراء = the purchase invoice

Both are possible, but they mean slightly different things.

In your sentence:

• رقم طلب = an order number / order number in a general sense

If you said:

• رقم الطلب = the order number

So the sentence as written means there is no order number present, without pointing to one specific already-known order.

This is also an iḍāfa:

• رقم = number
• طلب = order/request

Together:

• رقم طلب = order number

Because طلب has no ال, the whole phrase is indefinite.

It is another iḍāfa construction.

• رقم = number
• طلب = order

So literally:

• رقم طلب = number of an order

In natural English, we usually say:

• order number

Important rule: In an iḍāfa, the first noun is the thing possessed or specified, and the second noun tells what it belongs to.

Other examples:

• رقم الهاتف = the phone number
• باب البيت = the door of the house / the house door
• اسم الشركة = the company name

Arabic usually does not need a separate word that exactly matches English there in existential sentences like there is or there are.

Instead, Arabic often uses:

• يوجد = exists / is found
• هناك = there
• or both together: هناك ...

So these can all work in similar ways:

• لا يوجد رقم طلب = There is no order number.
• ليس هناك رقم طلب = There is no order number.
• ما من رقم طلب = There is no order number. (more formal/literary)

Arabic expresses the idea differently from English, so you should not expect a one-to-one word for there every time.

Yes, a common alternative is:

• في فاتورة الشراء لا يوجد رقم طلب
• في فاتورة الشراء ليس هناك رقم طلب

Both mean roughly the same thing: There is no order number on the purchase invoice.

The version with لا يوجد is very common and straightforward. The version with ليس هناك is also natural.

In formal written Arabic, يوجد is especially common in administrative, technical, and business contexts.

Yes. طلب can mean:

• request
• order

The exact meaning depends on context.

In business, sales, and purchasing contexts, طلب often means:

• order (as in a purchase order or customer order)

So:

• رقم طلب = order number

This is a good reminder that many Arabic nouns have a range of meanings, and context decides the best translation.

English usually says:

• There is no order number on the purchase invoice.

Arabic here says, literally:

• In the purchase invoice, there does not exist an order number.

This difference is normal. Arabic often puts:

1. the location or context first,
2. then the negative existential phrase.

So:

• في فاتورة الشراء = in/on the purchase invoice
• لا يوجد = there is not
• رقم طلب = an order number

The Arabic word order is natural and idiomatic, even though it does not match English word-for-word.

A fully vocalized version would be:

• في فاتورةِ الشراءِ لا يوجدُ رقمُ طلبٍ

Here is why:

• في is a preposition, so فاتورة becomes genitive: فاتورةِ
• الشراء is the second part of an iḍāfa, so it is also genitive: الشراءِ
• يوجدُ is a present-tense verb in the indicative
• رقمُ is the subject of يوجد, so it is nominative
• طلبٍ is the second noun in an iḍāfa after رقم, so it is genitive

In normal everyday Arabic writing, these case endings are usually omitted, so you typically see:

• في فاتورة الشراء لا يوجد رقم طلب

A careful pronunciation is:

• fī fātūrati ash-shirā’i lā yūjadu raqamu ṭalabin

Without case endings, learners often say it more simply as:

• fī fātūrat ash-shirā’ lā yūjad raqam ṭalab

A few pronunciation notes:

• في = fī
• فاتورة = fātūra
• الشراء begins with sh, and the l of ال assimilates, so it sounds like ash-shirā’
• يوجد = yūjad
• طلب = ṭalab with an emphatic ṭ

In a literal sense, في usually means in. But in English, when talking about documents such as invoices, forms, lists, and pages, we often say on.

So:

• في فاتورة الشراء literally = in the purchase invoice
• natural English = on the purchase invoice

This is a translation difference between the languages, not a problem with the Arabic.

Yes. That is a very natural English rendering.

Arabic uses an existential structure:

• In the purchase invoice, there is no order number

But in English, we often switch that to a possession-style sentence:

• The purchase invoice does not have an order number

Both express the same idea. Arabic often prefers the existential pattern, while English often prefers have in situations like this.