Hi
Step 1 - Go to SE16 and in table T012K check if the bank accounts are still there.
Step2 - If the accounts are there but it is now showing up in FI12, then go to SM30 and put the table name T012K. Then click on the icon 
. It will show the table name as T012K and click continue.
Step3 - System will open up a list of objects. From that list select the object VCL_T012_CORE.
Step4 - In the next screen you click on maintain.Enter the company code and after that it will show up all the house banks maintained in the FI12. Select the desired house bank and click on the bank accounts. It will now show you those bank accounts which you can not see any FI12 but still there in the T012K table.
Step5 - Delete those bank accounts.
Step 6 - Now go to FI12 and maintain those bank accounts with correct details.
Alternatively you can try to edit the bank account in the multicash bank statement file and try to upload that in quality system first. if that is successful, then you can do the same exercise in production system.
I hope this will resolve your issue.
Regards,
Pintu
