Creating and Updating SalesOrders via Web Services, Sending GL Accounts with Lines

Hi there,

I'm hoping to use GP Web Services to Create and Update SalesOrders and SalesInvoices, while manually specifying GL Accounts. Looking at SalesLine in the GP class reference, the GL Account properties are read-only:

https://msdn.microsoft.com/en-us/library/cc508133.aspx

Is there a way to specify these fields, beyond changing the settings for Inventories/Customers/General Posting? I doubt it, but it would be useful to the customer we're integrating with.

Thanks!