If you simply remove the billing document from VFX3 worklist, you will have discrepancy between reporting in SD and FI, which is not a good option.
Most probably you use some localzation soluton (this is often the case for countries where document cancellations are not acceptable from legislation perspective) - so the document might still show in some country-specific reports and cause problems during audit.
Please specify the country/localization that is used, also if you have custom development in addition to j-tables.
Resolving such kind of problems can be tricky in countries such as Greece or Russia.
Usually the cancellation problem is related to populating an external number to the SD or FI document, sometimes you require consecutive numbering without gaps, but since the invoice is not handled to the end customer (in standard processes you do not issue printouts from final billing without FI posting), there could be different options to solve the problem - depending on country. Usually the business users can advise you how this was handled before SAP implementation which can give you a good idea how to resolve it in the system.
For example you can cancel the billing and declare this legal invoice as invalid, resolve the problem with the preceding document and issue a new legal invoice (in some countries there is a special report at year-end to list all invalid invoices).
You can resolve the pricing problem, post to FI and then adjust the balances with credit/debit memo combination - in some countries it is not allowed to issue credit memos or invoice adjustments even in the same period.
You can resolve the pricing issue, post to FI, then initiate product return process, after that start the sales process again - there could be a problem if a promotion expires before you start the sales process again.
You can resolve the pricing problem, post to FI, then use re-buy process (you buy back the products from the customer - the only option for some countries to return goods), then sell again.