How to Enforce bank account for cash expenses and not for credit card acquittals- Expense Reports

Summary:

We have users who submit cash expenses and others who solely handle credit card transactions. In our organization, it's mandatory to enter bank account details for cash reimbursements. We've implemented a user validation rule for this purpose (attached). However, this validation applies to both cash and credit card transactions when creating expense reports. We need the validation to only apply to cash expenses, as credit card transactions are already settled by the organization. Please advise on this matter

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