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Project with multiple customers: unable to create a new project task line

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Posted on by CU28111444-0

Hi all

I have set-up a project with different customers to invoice to, and this worked out fine. I could create separate invoices for the customers:

However, now I want to add a new line to the project, I get the following error:

You cannot change Bill-to Customer No. because one or more entries are associated with this Project Task.

This seems a strange error to me since

1) It's a new task

2) I have done the set-up so that there can be more then one bill-to customer.

Is there a way to bypass this?

In a second instance, I also find it weird that I must specify a customer in the header when I have choosen to invoice my tasks to different customers, but I don't know whether this might be related:

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Dynamics 365 Business Central

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Gerardo Rentería Ga... 26,834 Most Valuable Professional on at

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Hi, good day
I hope this can help you, and give you some hints.

Create projects you can invoice to multiple customers | Microsoft Learn

Best Regards
Gerardo

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YUN ZHU 101,202 Super User 2026 Season 1 on at

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Hi, hope the following helps as well.

Business Central 2024 wave 1 (BC24): Create projects you can invoice to multiple customers (Task Billing Method)

https://yzhums.com/49938/

Dynamics 365 Business Central: Can we skip/ignore field validation errors?

https://yzhums.com/44435/

Thanks.

ZHU

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CU28111444-0 62 on at

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Hi all

I have followed the instructions you are referring to as well (and as shown in my screenshots). In this case, I believe it should work as I intended (unless there is something very particular I'm overseeing) and that this error shouldn't occur.

I'm don't want to write an extension and I know it can be achieved by Config Pack, but I am not a big fan of this procedure being used by an and-client as a lot of things can go wrong as well there, certeinly when disabling the verification.

I would only do this if this is an actual bug and if I'm not overseeing anything specific - that's a bit the context I'm looking for in this question.

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Mohana Yadav 61,214 Super User 2026 Season 1 on at

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If you can replicate it in a standard database without any customs then I think it is a bug/limitation.

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CU28111444-0 62 on at

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@Mohana Yadav yes, I think so too. I'm indeed working on a environment without extensions or customisations.

I have tried to narrow it down, and I can create project task lines and link them to different customers as long as I haven't created a sales invoices yet. From the moment I create a sales invoices for one of the tasks, I get an error when trying to add a new line.

I was retrying now and I don't get the error any longer when I post the sales invoice! So the error only appears when I have a sales invoice associated to a job task which is not posted yet.

So my conclusion would be:

1) It's a bug

2) It can be solved by posting the created sales invoice

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