Billwerk Bug: Addon (Component) upgrade order leads to Components order: '' is not a valid ObjectId. Expected a 24 digit hex string

Problem/Motivation

Billwerk Bug: Addon (Component) upgrade order leads to Components order: '' is not a valid ObjectId. Expected a 24 digit hex string.

Billwerk confirmed, that it's a bug on their side. We'll implement a workaround and revert it, once the bug is fixed.

However, there is a temporary solution that leads to the same result for the end customer. The active plan variant must be specified again in the cart and InheritStartDate=true must also be set. This looks like this as an example:

(02.04.25)

{
    "cart": {
        "PlanVariantId":"987654321abc",
        "InheritStartDate":true,
        "ComponentSubscriptions": [{
            ComponentId : "123456789xyz",
            Quantity : 1
        }]
    },
    "ContractId": "67e51c0348298e203c77ec2c",
}

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes