Importing CB batch to change bank code error

We have a lot of CB batches posted with the wrong bank code. Instead of reversing the entries and doing new batches with the correct codes, we are trying to export the posted batches, amend the bank code and import the batches again. However, cannot do so, as the error "Invalid Ap/AR clearing account" is displayed. Have ammended the clearing account and imported back, but still get the same error and batch cannot be imported.

Plse help