On the customerInvoice endpoint it is possible to sent in the 'account' on invoiceLine-level. The same kind of functionality is desirable on the salesOrder endpoint.
In the UI it is possible to change the account on the salesorder line, therefore we think that is should be possible to do trough the API. We have multiple customers that have requested this but since 'account' is not available in the salesOrder-endpoint we have had to do complicated and unstable workarounds. Nether 'SalesOrder' och 'SalesOrderV2' has the 'account' on salesOrderLine-level.