# Get Errors when generate B2C invoices

**URL:** <https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695>\
**Category:** Signing process\
**Created:** [September 6, 2023, 12:39pm UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695 "2023-09-06T12:39:49Z")\
**Posts on this page:** 10\
**Page:** 1

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**Author:** ![Tamer\_El\_Khawas](https://avatars.discourse-cdn.com/v4/letter/t/13edae/32.png) [@Tamer\_El\_Khawas](https://zatca1.discourse.group/u/Tamer_El_Khawas)\
**Post date:** [September 6, 2023, 12:39pm UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695/1 "2023-09-06T12:39:49Z")

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Hi All,  
I’m using the SDK to generate and sign invoice XML. For the B2B it’s generated and I tested it on the web based validator and it’s accepted with no warning or errors. For the B2C after generating the XML i get the following error when I test the XML on the web based validator:

## Errors

- category :\*\* QR\_CODE\_ERROR

- code :\*\*hashedXml

- message :\*\* hashedXml does not match with qr code hashedXml or the hashedXml is missing

- category :\*\* SIGNATURE\_ERROR

- code :\*\*invoiceSignedDataDigestValue

- message :\*\* wrong invoice hashing

- category :\*\* SIGNATURE\_ERROR

- code :\*\*xadesSignedPropertiesDigestValue

- message :\*\* wrong xadesSignedPropertiesDigestValue

- category :\*\* SIGNATURE\_ERROR

- code :\*\*X509SerialNumber

- message :\*\* wrong X509SerialNumber

- category :\*\* XSD\_SCHEMA\_ERROR

- code :\*\*SAXParseException

- message :\*\* Schema validation failed; XML does not comply with UBL 2.1 standards in line with ZATCA specifications

- category :\*\* SIGNATURE\_ERROR

- code :\*\*signatureValue

- message :\*\* wrong signature Value

Any clue why these errors and how to fix them???

Thanks

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<div class="post-metadata">

**Author:** ![Aturkistani](https://avatars.discourse-cdn.com/v4/letter/a/8baadc/32.png) [@Aturkistani](https://zatca1.discourse.group/u/Aturkistani)\
**Post date:** [September 6, 2023, 4:58pm UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695/2 "2023-09-06T16:58:10Z")

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please note that signing invoices from your side only required on B2C invoices, in B2B invoices ZATCA will sign it.

you can validate the invoices from SDK through this command :  
fatoora -validate -invoice [invoice file name]

If you are still receving the same signing error please follow the below steps while making sure you got the latests version of SDK installed:

1- get your CSR config file ready with all of the required inputs, then open the command line interface in the CSR config file path and type this command to generate the CSR and private key for simulation :  
Fatoora -csr -csrconfig [file name]

**Note** : simulation and production are independent environments, so if you want to generate a CSR for simulation please make sure to put the flag -sim

2- get your OTP from FATOORA portal that’s associated with the VAT number you have put in the CSR config file.

3- after submitting your CSR & generated OTP in the compliance CSID API, it will return you a security binarytoken, take this value and decode it using base64, and the output is the X.509 certifecate.

4- after getting your X.509 certiecate & private key, please go to the Certificates folder in SDK by following this path “SDK folder\data\Certificates”

5- after going to Certificates in the follwed path above, you will find 2 files:  
**first file** is cert.pem : you are requested to replace the X.509 cert value here, so copy and paste your X.509 cert. (make sure that the pasted value is already a decoded security binarytoken using base64 decoder).

**second file** is ec-secp256k1-priv-key.pem: you are requested to replace the value of your generated private key here. just copy your generated private key and paste it here.

6- now you will be able to sign your B2C invoices with your certificate, by using this command:

fatoora -sign -invoice [invoice file name]

and this is how sucessfully you can sign your B2C invoices for compliance checks, after getting your invoices signed you can go to the next step which is compliance checks (compliance invoice API), and submit your invoices there to obtain the production CSID\Certificate.

then you can validate the signed invoices using SDK with the mentioned command above.

please do not hesitate to reach out if you have any further questions.

thank you,

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<div class="post-metadata">

**Author:** ![Tamer\_El\_Khawas](https://avatars.discourse-cdn.com/v4/letter/t/13edae/32.png) [@Tamer\_El\_Khawas](https://zatca1.discourse.group/u/Tamer_El_Khawas)\
**Post date:** [September 19, 2023, 2:13pm UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695/3 "2023-09-19T14:13:11Z")

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Hi, I tried the steps you wrote but now I get this error on the CMD  
“invalid organization unit name, please provide a valid 10 digit of your group tin number”

this is what is in the csr-config-example I’m using

csr.common.name=300043295910003  
csr.serial.number=1-TST|2-TST|3-ed22f1d8-e6a2-1118-9b58-d9a8f11e445f  
csr.organization.identifier=300043295910003  
csr.organization.unit.name=Riyadh Branch  
csr.organization.name=3000432959  
csr.country.name=SA  
csr.invoice.type=1111  
csr.location.address=RRRD2929  
csr.industry.business.category=Healthcare Services

So any clues why this happens ???

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<div class="post-metadata">

**Author:** ![kiaziz](https://avatars.discourse-cdn.com/v4/letter/k/dc4da7/32.png) [@kiaziz](https://zatca1.discourse.group/u/kiaziz)\
**Post date:** [September 24, 2023, 6:48am UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695/4 "2023-09-24T06:48:39Z")

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Dear @Tamer_El_Khawas,

please note that the error is because you just need to sign the invoice first using the SDK before validating it, a new signed invoice will be generated this is the one to be validated.

Regards,

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<div class="post-metadata">

**Author:** ![Tamer\_El\_Khawas](https://avatars.discourse-cdn.com/v4/letter/t/13edae/32.png) [@Tamer\_El\_Khawas](https://zatca1.discourse.group/u/Tamer_El_Khawas)\
**Post date:** [September 25, 2023, 12:28pm UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695/5 "2023-09-25T12:28:47Z")

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Hi, are you replying to my original post or to my latest reply? I’m confused now.  
If you are replying to my original post, I’m already using the SDK and it’s supposed that the SDK signed the XML file, but for some reason which I don’t know it returns these errors when trying to test it on the online validator. So as Aturkistani adviced is to generage a new certificate by generating csr and private key. Here I also faced an error I sent in my reply.

Please advice, Thanks

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<div class="post-metadata">

**Author:** ![kiaziz](https://avatars.discourse-cdn.com/v4/letter/k/dc4da7/32.png) [@kiaziz](https://zatca1.discourse.group/u/kiaziz)\
**Post date:** [September 25, 2023, 12:55pm UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695/6 "2023-09-25T12:55:29Z")

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Dear @Tamer_El_Khawas ,

yes sorry i didn’t see it,  
please use the below we changed the org.unit.name to be the tin number and it will work as expected:

csr.common.name=300043295910003  
csr.serial.number=1-TST|2-TST|3-ed22f1d8-e6a2-1118-9b58-d9a8f11e445f  
csr.organization.identifier=300043295910003  
csr.organization.unit.name=3000432959  
csr.organization.name=300043295910003  
csr.country.name=SA  
csr.invoice.type=1111  
csr.location.address=RRRD2929  
csr.industry.business.category=Healthcare Services

Regards,

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<div class="post-metadata">

**Author:** ![Tamer\_El\_Khawas](https://avatars.discourse-cdn.com/v4/letter/t/13edae/32.png) [@Tamer\_El\_Khawas](https://zatca1.discourse.group/u/Tamer_El_Khawas)\
**Post date:** [November 18, 2023, 5:15pm UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695/7 "2023-11-18T17:15:25Z")

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Dear Kiaziz,  
I managed to generate the csr and private key files. but still after using them to sign the document using ZATCA SDK the signing process fail on the second step which is generating the digital signature. I tried to trace to see where it goes wrong and I found that the issue is in this line of code in the SDK dll:

object pemObject = pemReader.ReadObject();

This line in the the function named GetDigitalSignature in the class named EInvoiceSigningLogic.

the ReadObject method returns null.

Any clue why this happens???

Thanks in advance

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<div class="post-metadata">

**Author:** ![ad.almusbahi](https://avatars.discourse-cdn.com/v4/letter/a/dc4da7/32.png) [@ad.almusbahi](https://zatca1.discourse.group/u/ad.almusbahi)\
**Post date:** [November 23, 2023, 7:36am UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695/8 "2023-11-23T07:36:09Z")

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Dear @Tamer_El_Khawas,

I face the same issue. It got solved when I changed the private key format to PEM.

regards

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<div class="post-metadata">

**Author:** ![Tamer\_El\_Khawas](https://avatars.discourse-cdn.com/v4/letter/t/13edae/32.png) [@Tamer\_El\_Khawas](https://zatca1.discourse.group/u/Tamer_El_Khawas)\
**Post date:** [November 25, 2023, 9:48am UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695/9 "2023-11-25T09:48:11Z")

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Dear @ad.almusbahi ,  
Thanks for your reply. Can you guide me how to do this after the key is generated from the SDK. or you mean there is another way to generate the key without using the SDK? I appreciate if you can put the steps to your solution.

regards

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<div class="post-metadata">

**Author:** ![ad.almusbahi](https://avatars.discourse-cdn.com/v4/letter/a/dc4da7/32.png) [@ad.almusbahi](https://zatca1.discourse.group/u/ad.almusbahi)\
**Post date:** [November 27, 2023, 8:18pm UTC](https://zatca1.discourse.group/t/get-errors-when-generate-b2c-invoices/695/10 "2023-11-27T20:18:33Z")

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Yes, sure.  
there are two ways to do it.

1. Use the OpenSSL command to convert the private key format “openssl ecparam -name secp256k1 -genkey -noout -out private-key.pem”.  
2-C# code to convert the private key to PEM format:

```auto
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.OpenSsl;
using Org.BouncyCastle.Security;

class Program{
	static void Main(string[] args){
		string privateKeyContent = "XXXXXXXXXXXXXX";// the private key contant genetated by ZATKA SDK
		AsymmetricKeyParameter privateKey = PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKeyContent));
		privateKeyContent = ConvertPrivateKeyToPem(privateKey);
		Console.WriteLine(privateKeyContent);
	}

	public static string ConvertPrivateKeyToPem(AsymmetricKeyParameter privateKey)
	{
		StringWriter stringWriter = new StringWriter();
		PemWriter pemWriter = new PemWriter(stringWriter);
		pemWriter.WriteObject(privateKey);
		pemWriter.Writer.Flush();
		return stringWriter.ToString();
	}
}

```

Regards