[12.0] Order line billed quantity not updated

[jypsmh]

After merging 2 invoices, billed quantity on order is not updated.

[sergiocorato]

Billed quantities are updated on invoice creation, invoice merge is not involved AFAIK.

[jypsmh]

not agree in v12
2 orders, with 2 deliveries, 2 draft invoices : ok, we see billing quantity on purchase orders
account invoice merge of the 2 draft invoices
a new draft invoice is generated ok, and the 2 original draft invoices are cancelled
but the cancel of original invoices remove the billing quantity on purchase orders

[github-actions]

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