JBA ML - 'H'eld invoices

>From time to time our clever people in the customer service department generate
invoices that have a print flag of 'H'

Once a invoice reaches this state (usually because of a zero priced line item)
it is un-printable and un-fixable though a screen and so for all intents and
purposes is a dead invoice.

I usually just tell customer service 'to bad you will have to re-key the
invoice', but in this case I have taken pity on them, the held invoice this time
is actually a monthly consolidated invoice and so has a heap of deliveries
(alias line items) on it.

Question:  Has anyone ever been able to 'fix' a held invoice.

If it is of any importance we are on 3.5.2b SP4 using advanced pricing.

Thanks,
Gary.