Our client has an invoice that is not showing up as available to apply to receipts, credit notes or refunds.

There are no open batches.

When viewing customer inquiry also I cannot find anything allocated to the invoice.

I went as far as comparing an invoice that does show up with the one that doesn't and in AROBL nothing differs between the two except the date, amounts and document number. Not one of the two shows anything against apply to or any decrease in balance outstanding amounts.

I have done a data dump and load into a clean db as well without any effect.

Any other ideas I could try?