Building a new External Bank Account Reconciliation Rule

 Morning/Afternoon, I am currently in the middle of building an automated book to bank reconciliation process for multiple bank account across multiple banks and have a question regarding creating a new reconciliation rule ?

To provide you with some background I am using the BAI2 bank statement format to load in my transactional data using the Oracle delivered Import process and then reconciling the bank statement data using the Automated reconciliation process. The bank statement data is being reconciled to system transactions imported from a 3rd party system using a customisation, directly into the PS_BNK_RCN_TRAN table, using the delivered fields.